How Do I start talking to this girl I like...?

Ok umm, I was going to say you can talk to her in real life but I know that's not going to make you happy so here is some advice. Start a talk on facebook, as her how she feels about high school and then start asking her questions about herself and her interests etc. Maybe after a few conversations and depending how it goes you can ask her to hang out or something and meet up in real life you know?