Trade Exchange! Here is what you do if you want to sell:

1. Either find or make an topic of the item you would like to sell
   
2. Wait for a moderator and an a person who wants the item you got to come
   
3. Tell how much you would like to sell for (haggle if you like )
   
4. Wait for mod to apply it
   
5. DONE!
   

*If you want to buy is pretty much the same, but your buying not selling*
But if you want to trade:

1. Find or make an topic
   
2. Wait for mod and person
   
3. Tell what you would trade for the certain item and so on
   
4. Wait for mod to apply it
   
5. DONE!
   

But, one thing, you can make an profit out of this if you think carefully- and also yes you can sell more than one item (1-3 at an time)
See you soon!