Well you will actually need a AERC certified ride manager, I think you will also need a certified trail master . Contact AERC, I know they maintain a list of endurance vets, Should also have list and contact info for RM... Not certain but I believe Ride manager works on a mentor program, basically you have to be an assitant RM first. Check your magazine for stephanie teeters poc, she is the RM director for your area, magazine has email and phone number for her. That's who can either answer your questions or tell you who to talk to. Unless that was the Steph you were referring to in your OP.
Lots of your questions answered here, Ride Managers - Forms
I also found this article that was very helpful: