I use a program called Site Build It. It's extremely user friendly, especially for people that don't know any coding at all. Since you know some HTML, you're ahead of the curve. You didn't mention if you are going to be selling actual hard goods or if your just going to be the middle man for your customer. No worries though, if you're selling the actual product yourself this page might help you, http://hardgoods.sitesell.com/whfe.html
Site Build It caters to your specific needs and walks you through building your site with the "action guide". It's a ten day, elaborate, "work at your own pace" help guide. I'll leave the link to the action guide, and some helpful ebooks below.
Hope you find what you're looking for, good luck!