Design a Website Mockup

I need to create a website like [login to view URL], [login to view URL], [login to view URL] where people can buy and sell books by posting them into our website. The sales process will be different from these websites. It will be the following: Selling books: 1. Customer (Seller) is interested in selling book 2. Customer (Seller) creates a seller profile (personal info,cc info, etc.) . 3. Customer (Seller) posts book and information to our website or comes to our store so that we can post for them. 4. Customer must be verified. 5. Customer (Seller) gives us the book after they post/before we sell it (has 3 days to deliver us the book after they post it) 6. We will contact them as soon as we sell it to give them their money. 7. We contact the customer (seller) so they can come to our store and pick up their money. Buying books: 1. Customer (buyer) is interested in buying book. 2. Customer creates a (buyer) profile (personal info, cc info, etc) 3. Customer (buyer) goes online and commits to purchase (3 days to pay). 4. Customer purchases book online using a credit card, paying through paypal, or bank transfer. The other option is the customer comes to our store and pays for the book there. 5. We contact the seller so that they come to our store and we can pay him/her.