Database Web Site

Hi, we are looking to create a database website with e-commerce. We need an admin area so we can add products, descriptions, images, etc. We have a few thousand items. We need the ability to add several modifiers to each item. For example a T-shirt printed with 1 to 6 color front and also a back print and sleeve, this creates many variations and pricing options. Give me details on what platform and software you would work on to create this site, time to complete and costs.