You need a clearly designed website where users and search engines can immediately see which products or services you are selling.

The product needs to be clearly displayed.  Professional photographs will enhance the look of the site.

You need to set up a method for accepting on-line payments so that your customers can buy directly from you and feel secure in the transaction.

You also need to consider how to promote your site once it has been built. The two most common methods are Pay Per Click (PPC) and Search Engine Optimisation (SEO), with most companies using a combination of the two.