Build an Online Store

I would like to build a website to sell T-shirt. For now, I would like to do some concept proof and the website could be easy and clean. However, at least I need following functions. [login to view URL] users to upload pictures and edit text on a picture of T-shirt, so that users can design their own T-shirt as they want. And through our web, user in the end can see how the unique design look like on a T-shirt. 2. have all other basic functions as an online store. Like listing items, search for items, and transaction. The function is like this web [login to view URL] I think their logic about how to use the web is very confusing, but it does have the key functions I want. This is not a final comercializable project, but I need to have a prototype web. Thus, as long as the result web has all basic functions, it will be ok for me. It doesn't have to be fancy at all. If the result is good, we do want to collaborate for a long term or provide employment offers.