Okay, thanks man.
Another question that bothers me is the margin, can you thoroughly explain that to me? If I will put 10%, what will be my earnings?
Simple,10% of whatever you're putting.Use an online percentile calculator
http://www.percentagecalculator.net/ .Be very careful in setting up the margin,always keep it higher if you're selling the coins.Also make sure you're online when a request is sent because as soon as someone wants to trade with you,your coins are held in escrow and they won't be returned unless the transaction is out of frame window which is 60 mins I guess or the opposite party has to disconnect it.The best thing to do in such cases is,only post a trade request when you're online and delete it after you log out.