How to start with this girl on facebook?

She's very pretty, but she goes to another school, so I won't get to see her in person to talk to her. I added her as a friend on facebook because I thought she was pretty. Now what do I do? And how do I keep from sounding creepy? LolHow to start with this girl on facebook?
just say hey i saw we had some friends in common, wanna chat?

bird