I'm friends with this girl on facebook, we go to the same college but I've never spoken to her or anything and I don't see her around long enough to talk to. How can I start talking to her without looking like a stalker. I was thinking saying something random then saying wrong person but then I don't know what to do. Any help?

This is pretty simple.

Do not:
Poke her,
Press "Like" on all her random shit
Invite her to stupid Groups like "I've been drunk with at least one person in this group"
Write to her and say "uh sorry wrong person".

Do:
If she joins a group like "Edward Cullen Is Perfect" go against that and comment "No way, Jake is way cooler - he deserves Bella" and create a small talk through that, and pick it up at school and continue the conversation in real life. (Note: obviously this only works if you actually know something about whatever topic it is)
Another one could be In the facebook chat write a simple opinion opener like:
PUA: "Black or white?",
HB: "What?"
PUA: "Just play along, black or white?"
HB: "What do you mean?" (She might just say black, but if she's the least bit curious she'll want to know why)
PUA: "It's a secret, if your lucky I'll show you why in class tomorrow"
HB: "All right white then"
Then you go ahead and put on a white shirt the next day, say it was laundry day and all you had left was this white good looking shirt and kind of a strange black one, so it was a good call from her side.. Or whatever I'm sure you understand what I mean, but just create a small topic on Facebook that will work as your opener the day after.

It's as simple as that.

Good Luck.