I have a forum which we are just getting started, no MMA members but ahahah..

Are we allowed to advertise it here or put it in our signature?

Yes ofcourse!
As long as it is not something like childporn, adverts, malware etc etc and Im sure it isnt in your case.

Use your better judgement.

www.sticksportsforum.com (we took over the official sticksports forum when it closed down)

We are just a general forum, be good to have sports members over there, we do quizes, battrick, fantasy cricket, fantasy wrestling yada yada, we are two months old, dont sign up if you wont stay active.

Thanks guys