Build me an Online Store

Looking for a website designed from the bottom up simple ecommerce site minimal pages but key is the categories and products. Would like to be able to have it fully designed then handed over so i can upload products and any descriptions, prices, stock levels and the ability to modify if necessary with a simple backend being key for future development. Have a basic design that i threw up on paint and color scheme the rest i will work with the designer for any addition information required. I'm looking for a simple / clean / modern feel, the website will be for fitness supplements / health products.