As denuseri said, you can google local organizations. Be sure to add your city and state in the search otherwise you'll end up with a slew of groups from all over. Personally, if you have intentions of having a r/l BDSM relationship, be sure to log in some time with that person prior to any play. I invested 6 months of communication into my Dom before we played. I would highly recommend that to everyone!! I have never participated in an online relationship and can't really give input on that. The people on this site are very respectful and nice. i'm sure you can meet a lot of Dommes here. I wish you the best of luck.

Oh!! And remember... make sure anything and everything you do is safe, sane, and consensual!!!