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How to build an ecommerce website: what it is made of, what to build first, and what to set up on day one

Most guides to building an online store start with picking a theme. We start with the data: 42.6 thousand orders in online stores we grow show where sales come from, when they arrive and who comes back. The build order follows from that: which pages first, how many products to launch with, what to set up on day one, and what it costs in money and time.

A shallow tray of frosted pale green glass divided into compartments like the layout of a web page, some compartments holding fitted tiles of green marble, one more marble tile resting beside the tray, in a bright studio with diagonal window light
A store is a layout first. The question is which compartments you fill first.
39%
of item revenue in the median store came from its top ten products. Build the site around them
29%
of orders in the median store arrived between eight in the evening and seven in the morning, with nobody at the desk
13%
of orders in the median store came from returning customers, within nine months. Repeat buying is built from day one

What is ecommerce, and what is an ecommerce website made of

Ecommerce is buying and selling online, from choosing a product to paying for it, with no conversation needed. An ecommerce website is the online store where that happens: a site where a customer chooses a product, pays and gets an order confirmation without talking to anyone.

It is not a brochure site with a "buy" button. Several components work behind every order, and each must work when nobody is watching:

Platform choice has its own article. In short: when the store is the business, we build on Shopify, because checkout, servers and updates are the platform's job, not yours. Why, and when to stay on WordPress, in Shopify vs WooCommerce.

This article is about the build itself. The numbers come from 42.6 thousand orders in Israeli online stores we grow, January to September 2026, across several platforms. Figures are aggregates, and the lessons hold for a store in any market.

How many products to launch your online store with

The common mistake is to start from the catalog: upload every product, build dozens of collections, then ask what will sell. Sales do not spread out that way.

In the median store, the top product alone brought 6% of item revenue, the top five 25%, and the top ten 39%. The median store sold about 230 different products. At the other end, about 68% of the products that sold at least once sold fewer than ten units in nine months.

How much revenue comes from a few products

Share of item revenue, before order-level discounts. Median across stores.
Source: Preneuriat client dashboards, online stores we grow, 1.1.2026 to 28.9.2026. Aggregates only.

The lesson: build around a small set of hero products, not a huge catalog.

No sales data yet? Start from what already sells, at markets, on Instagram, on a marketplace or through resellers, and revisit the list after the first month.

The pages that sell, and the order to build them

Every page has one job. Build them in this order, by how much revenue depends on each:

  1. Hero product pages. Where the decision happens. Shots alone and in use, a clear price, delivery time and returns next to the button, and answers to the questions customers ask over chat.
  2. Cart and checkout. Few steps, shipping cost shown before checkout. A cost that appears only at payment is the classic cause of abandoned carts.
  3. Home page. It directs rather than shows everything: to hero products, the current promotion and main collections, in one phone scroll.
  4. Collection pages. Filters and sorting that work on mobile, hero products at the top.
  5. Trust pages. Shipping and returns, terms, privacy, about, and a contact option that is easy to find.
  6. Campaign landing pages. A page that continues the ad in message and look, instead of sending everyone to the home page.

The store sells while you sleep

In the median store, 29% of orders arrived between eight in the evening and seven in the morning. Nobody is there to approve an order, answer a sizing question or fix a failing coupon.

So everything between "add to cart" and "order received" has to run on its own:

The test is simple: before launch, place a test order from a phone, late at night, end to end. If it needs a person to complete, the site is not ready.

Day one: measure, and keep the customer

Two things are almost impossible to add after the fact, so they go in before launch.

Measurement. Analytics connected, Meta and Google pixels reporting purchases at the right value, tagged links for every channel, and a dashboard of real store revenue against all media spend. The first months are the baseline for every later comparison, and uncollected data never comes back. Why store revenue beats platform-reported numbers: real ROAS vs reported ROAS.

Customer capture. In the median store, about 10% of customers ordered twice or more within the period, and 13% of orders came from returning customers. The median second order arrived about 30 days after the first. A caveat: the period starts in January, so some orders counted as "first" belong to customers who had bought before. So these figures are a floor. Even so, most customers bought once.

A returning customer does not just happen. You build one:

A returning customer is not a gift. It starts with one field at checkout, on day one.

After launch: what to plan in advance

Launch starts the work. Plan three things during the build so they do not force a rebuild:

What it costs to build an online store, and how long it takes

We will not quote prices, because they change and differ by market. A proposal should list each component separately: the platform (a Shopify subscription, or hosting and maintenance on WordPress), theme and design, setup (product upload, photography, copy, integrations, testing), payment processing fees on every transaction plus a platform fee in some setups, tax and invoicing tools, shipping, and ongoing work after launch.

Timing varies too, but the phases do not: scoping (hero products, audience, channels and what to measure), infrastructure (platform, payments, shipping, tax, invoicing and a test order), content and design in the page order above, testing on mobile and in measurement, then a soft launch before the first campaign. The pace is usually set by content and photography, not by development.

Common mistakes when building an online store

If you sell in Israel

An Israeli store adds its own layer on top of everything above. The theme has to be right-to-left Hebrew everywhere, including checkout and emails. Prices are shown in shekels with VAT included. Shopify Payments is not available in Israel, so payments run through a local payment provider, and every transaction needs an invoice that meets Israeli rules, which Shopify does not issue by itself, so an invoicing integration is part of the build. Shipping rates have to cover the whole country, and stores that observe Shabbat schedule promotions to open on Saturday night. The full local setup is in the guide to Shopify in Israel.

Building it with Preneuriat

Building a Shopify store is half the job. The other half is bringing buyers, and when different vendors do each half, something falls in between. We do both, for brands in Israel and in other markets.

None of this guarantees a result. It removes a common risk: a piece that falls between two vendors.

Questions we get

What is ecommerce?

Ecommerce (electronic commerce) is selling products or services over the internet, where the customer chooses, pays and gets a confirmation without talking to anyone. An ecommerce website, or online store, is the tool it happens on: catalog, cart, checkout, payment, shipping and tax in one system.

How do I build an online store step by step?

Choose a platform, then build in the order revenue depends on: hero product pages first, then cart and checkout, home page, collections, trust pages and campaign landing pages. Before launch, connect payments, shipping, tax and invoicing for your market, wire measurement and customer capture, and place a full test order from a phone. Then launch softly, before the first campaign.

How much does it cost to build an ecommerce website?

It depends on the components and the market, and prices change, so we do not quote them. What to budget for: the platform (a monthly subscription, or hosting and maintenance), theme and design, setup work and product photography, payment processing fees, tax and invoicing tools, shipping, and ongoing work after launch. Ask for a proposal that lists each component separately, including the monthly costs.

Shopify or WordPress for an ecommerce website?

For a business whose store is the business, Shopify: checkout, servers, updates and security are the platform's responsibility. WordPress with WooCommerce is better when content is the business and the store is an add-on, or when there is deep custom logic and a developer who maintains it. The full comparison is in Shopify vs WooCommerce.

Fit check

Want to see your real ROAS?

Every Preneuriat client gets a live dashboard: store revenue, all media spend, real ROAS, updated all day. The first call goes both ways.

Check the fit