Build a Website

I need a new website. I need you to design and build it. Here's a brief description about the project - > We need a website where buyers and sellers can trade on copyright videos >Sellers must have the ability to upload the videos which will be up for a bidding process and the buyer with maximum bid in the given time frame wins the copyright to video >Each buyer can bid an price but other bids are invisible to him >Upon upload, the video shouldn't be displayed to buyers in original format but in a format which has a hallmark (to prevent piracy) >Thus there must be 3 different accounts - buyer, seller and admin >You can imagine it as a marketplace for videos