I'm not a yoga instructor but I have been doing yoga for quite awhile- at home with tapes and in a studio with an instructor. I, too, have been interested in teaching to special populations (I'm a special ed teacher and think some of our special needs kids could benefit from yoga) through our local Parks & Rec dept. I asked one of my instructors a while back how to go about getting started. She said that you do need teacher training and certification. There are yoga institutes all over the world and you pay a pretty penny to attend one to be certified, or you can ask at one of your local studios where to be trained and certified. There is a studio in my city that does training and certification. Good luck to you! Now that I've had my babe it will probably be awhile before I persue it.