Casual encounters in a club

(I'm gonna mix in german and english in this post, german for as much as I know, english for what I don't. If any of my german is wrong, please tell me :) ) I am returning to Germany for the second time in three weeks (Jan 10)! Ich bin sehr aufgeregt!! I will be in Bremen for a week visiting a friend, along with one of my friends from das Vereiningten Staaten who is coming with me. Obviously we'll be spending quite few nights in the clubs. This may sound like a stupid question but is there a "culturally accepted" way of talking to girls at the club? Any phrases that german youth would use that wouldn't necessarily be taught in the rocket course? Any tips for an american? haha Danke!!!