Simple Website with shopping cart for 20 products

It is a site for a new product just recently patented. I'm going to have about 20 thumbnails of fabric swatches to choose from, so web users can choose a fabric for their product. I'll need some sort of field box for the customer to have a way to list the: height ______________ inches width ______________ inches depth ______________ inches of their product. (it is a custom made fabric cover, product isn't too important in the bid i would think.) We will need a shopping cart and a credit card processing of some sort (possibly paypal API) with a back end to manage it all. The pages need to be managed as well from the backend with the ability to add more products later (more swatches and more covers possibly). I have a logo concept already, I'd like greens & browns - tropical but not bright.