The two most popular ways to create a photography website and sell your photography online are:
Smugmug is the quickest and easiest way get a site and start selling. Smugmug sites are also very professional-looking and they handle the stuff like shopping carts and so on for you.
Your own Website and Domain name. This is what people think of when they think “my own website”. I have created a tutorial to help get you up and running quickly.