Try your local GLBT Center. That's how I found mine. If they don't have a therapist there, they can probably refer you to one.
As for choosing the right one, you'll know when you find them. I trust mine a lot, after only three sessions. She also asks me questions that I never thought to ask myself. I'd say there's a certain chemistry and trust between us, that I also have with my other therapist. Watch for that chemistry. And give each hopeful a few tries before judging them. Good luck!