Etsy Type Shop In BuddyPress

I am new to the site and was wondering if anyone had a step-by-step guide on how to creat an Etsy type store in BuddyPress with MarketPress. All I want to do is have my users be able to post products for sale, and then take a percentage when the products sell. It would be great to be able to have one central cart when users can choose products from multiple sellers and only have to pay once. Any help would be greatly appreciated.