How to approach a guy on Facebook?

Bunnyl
Hey everyone, so let me explain my "situation" pretty quickly :

Basically, 3 months ago I added this guy on Facebook, because I guess I had a little crush on him. So he's in my school as well, he's a little younger than me (I'm a senior and he's a Junior, not that that matters), and I've always wanted to talk to him but I never had the time, or the courage.

We have a mutual friend and I talked to this about her, and she said I should go for it because he's super nice, and I'm his type of girl, but I really don't know what to say to him without seeming like a creep or a weird stalker like "hey I added you 3 months ago, but I'm only talking to you now because I have a huge crush on you", so BASICALLY I'm asking you guys (girls are welcomed too) what could I say to approach him ? (Also don't tell me just go on the fb chat because he's NEVER online, so I have to send him a message, and I hate it because it seems like everything is thought through, and it's not spontaneous at all)

Thanks people :)
How to approach a guy on Facebook?
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