A 1 x post newbie, will not receive any BTC from anyone with a dodgy idea.
How would you create a peer to peer market based on Bitcoin? The Seller will inject his message into the blockchain, advertizing his products or services... but how would the buyer know about this message, if it's not advertized somewhere? {The moment when this is posted on a centralized public server, it would be taken down}
Who will Escrow the money for the transactions? {Centralized again} You need people to trust the system.
Why would you expose yourself to this? Was Ross and Silkroad not proof enough, that these Markets will be targetted by governments and then taken down?
Good luck, but I think this will not work.