This is probably a dumb question, but how do you get off with starting to MM, obviously at this point I would be looking for small jobs, until I am more trusted in the community.
you have to put in an application, and they will allow you to middle man if you are good enough, e.g 500 vouches, 2 years in the buisness
Well, you would first of all want some vouches under your belt. I would say less than 40 won't help because people won't use you. I would suggest skilling/questing for vouches, selling gp etc and then when you have enough vouches (40+) start MM'ing. Donating might help too.
As rstrader has said get some vouches. Look for quality vouches rather than quantity, so higher valued vouches are better, donators also look good as a MM, also you have to be active in the community by my guess. If you only have x amount of vouches worth x dollars and no1's heard of you apart from being in the market section you wont get much business cause people dont know what kind of person you are.