oh man you got the best job! You have the inside scoop on everything. I used to work at a club and as a girl walks by you can tell her pretty much anything as your fairly non threatening.
Somethings you can say "hey do you think that guy is cute over there?"
her "yes" or "no he's not my type"
She says yes, go introduce them
She says no, start describing your features loosely.
Say stuff like, I bet you want a guy that's taller than you, with good bone structure, athletic, dark/light hair
Once she agrees with all your features say something like "so maybe you'd be interested in my twin
"you get her laughing and it's all downhill from there
That was my favorite set up when I worked there