Build a Website

I would like to have a fully functional eCommerce site that can support many products. Data entry must be simple and easy to enter. Percentage discounts, specials,closeouts. Also need the site to have a fully functional cart utilizing [login to view URL] and PayPal. Customer review pages as well as a map and contact [login to view URL] site will use many drop down menus. There will be links to other companies web sites that you will link to also, right now only two or three. You will do the SEO and keyword research and implementation into the site.