I want to create my own website that is an online store, how can I do it?

I am a freelance web designer and developer, and through my experience there are several ways it can be done. The most expensive would be paying some one or an agency to build a site for you. Website builders such as Shopify, Squarespace, Webflow, Wix have dedicated eCommerce website options, with a number of different templates to use. The last option would be paying an independent developer to set up one of these for you, and may be the easiest and fastest option.