create website

I would like a page like [login to view URL] is what page I want is to sell and buy items online. characteristics that must possess the website - Sign up page, anyone who wants to sell an item have to sign up. - A page showing all product and prices and 'Buy Now' button. (User can buy without registering) - Separate control panel for registered members, where they can see their information and product they have sold or purchased. - Database to store the user information. (viewable by admin only) - Payment gateway integration to your account and you will transfer the money to the seller yourself. a search bar, I mean such as the google toolbar, just type the word you want to find and the page will tell you if we have it or not, and if we have what you are looking for then show you the Product