So I guess I’d go to a gay/lesbian bar or event, or at least one that’s LGBT-friendly so if the girl you hit on isn’t into girls after all, it won’t be a big deal… and then take matters into your own hands!
You don’t need to be super-aggressive. Just strike up a conversation, get the ball rolling, and see what happens. If she’s interested too, then it shouldn’t be too hard.
And hey, if this is all happening in some kind of queer space you might not even have to work that hard… maybe they’ll come to you. But will it be the girl you were eyeing from across the room, or will you have to go after her? I’m sure once you dip your toes back into ladies’ scene, you’ll feel more confident pretty quickly.
Good luck! You seem to have a sexy attitude, and I see lots and lots of kissing in your future.
Love, Flash [a bisexual girl in a nonmonogamous LTR with a guy… who has to get her girl action on every now and then]