Just another teen pursuing a crush in need of wise advice?

Well, I went to a pride party last night. I saw girl I knew through another friend. I had always thought she was cute but didn't realize until last night that was into other girls. So we danced and made small talk. I was realy nrervous because my straight friends (who came for support) were pressuring me. I've been with about 4 guys. That's always been easy for me because I just have to let them know I'd like to be pursued. But I'm not the femme in this situation. She's the more feminine one and I feel responsible for pursuing her. I'm 16 and she's 15. Both ladies. We swing in other circles so I wouldn't run into her again. My goal is to get cosy with her over Facebook and then make a date in person and let it go from there. We're both writers and into music. Mostly rock. Bowie, Joan Jett, that sort. I want to know how to make her feel comfortable talking with me and how to start a conversation that is interesting and will last. I've never pursued a girl. I'm flailing here, people! :P Thanks in advance!