I'm attracted to her, but i have no connections to go further...

As it says...
I really like this girl... She's in the year below me, but with other people i like, i've had them in my class, or my mates mates with them etc....but this time, thats all different. I'm not in her class, my mates arn't mates with her or her mates, i don't even know her name for christ sake!

It's just this attraction that i want to get more from. I want to get to know her, but i don't even know how to introduce myself...

a little help please...