Well, to tell you the true for a start if you want to start MMing you need to build trust and rep here Omm is a long process and takes a lot of work, and you must be suitable.
I wouldn't make it yet. I would concentrate of getting a decent amount of vouches first. And then advertise the thread through a signiture promotion. That should get you going.
Build Rep & Trust, Since MM is A Big Job Since You Will Hold The Buyer's Payment and Seller's Product... And You Will Be The Prevention of Scams and Bad Trades