I suggest picking up Charles Wells books for starters. Also Traildamage.com is fairly comprehensive from mild to wild.
Start with the easy runs and work up from there. Venture out with the club or pick a friend and wheel with them. Good easy trails I would recommend are Bill Moore, Slaughter House Gultch. If you want a taste of shelf roads, Mosqiuto pass or anything outside of Ouray.
Have fun, check out a meeting, ask questions.