you sound like a good guy, so im not going to go into how to get her in bed, as i see it there is to excellent ways of going about this, though it completely relies on your personality.
you can either aim high, be a the friend that is always an object of lust for the girl lurking about in the dark corner of her mind or you can shoot straight for the LJBF-zone.
the pro's and cons are that if you choose the first approach she'll probably use you as a rebound in case she gets single, she might even cheat with you however there's a rather large chance that she'll try to block your attempts at gaming her friends, and if you do anyway you might end up in a lot of social trouble.
this is something you'll want to avoid
therefore, i suggest, especially since it seems that you are quite new to the game, that you let your self fall into the LJBF-zone, that allows you to get easy introductions to her friends through her, you can even after a little while (if you displayed yourself as a nice, funny guy) actually ask her if she want to try and set you up.
never, ever, underestimate a womans love for playing mix and match, they truly enjoy it!
et up the date, let her decide if she wants to bring her BF, and take it slow from there
good luck mate