Hey can someone tell me what the rules for selling stuff on the market are? or where i can find them? Cuz i dont want to b banned....

Read the stickies there.
Basically, don't spam, don't post shop links, on.toribash neither, don't post useless stuffs etc...

Each subforum has specific rules, so like Fyerr said, check the stickies before you post in each board. You'll see a thread of rules near the top of each one.

Global Market Rules
Art/Textures
Requests
Items

The biggest ones that have the most violations are bumping your threads illegally, posting textures in too large a resolution without a disclaimer, and advertising your torimarket links... keep a special eye out for those.