How to start a conversation on facebook with someone you like?

[Footy hero]

I have feelings for a girl in the year below me. I have spoke to her a couple of times but not much, she is very attractive and I would like to hook up with her which hopefully then leads to something more than just friends. However, in order to be closer we need to talk more. If I talk to her on facebook that can easily set things up for me to talk to her at school.

How should I start off the conversation on facebook without sounding creepy seeing as we do not talk much?

[BIG DADDY COOL]

say HELLO