Does she like me back? What do i do?

Theres this girl at school i like but i dont know how to talk to her. I stare at her in cl alot and sometimes she looks back at me. I would talk to her but i dont know what to say. �I "accidenty" pushed her over to try to start a conversation, but she fell and i got nervous and ran away. �Also i said a Lord of the Rings joke in cl, but nobody-including her-laughed. �Now that its summer, i decided to make a facebook and add her as a friend, its been 1 week 2 days and she hasnt accepted yet. I know where she lives, should i go to her house and try to talk to her? What should i say? If not, what should i do?