Is this a good Idea? What should I say?

Hey! I'm a shy girl too and i think it's super sweet that you seem to really like her. I def. think you should message her over facebook and just ask her whats up. After a few minutes just say something like Well would it be ok if i got your number? or somethin like that..don't say i'm gettin off text me on--------and give your number..i hate when guys do that. But anyways i'm sure she'd give it to you and then you can ask her. Good Luck bud. (: