The easiest way to pull is on the floor. Most of the girls who're on the floor are out looking for fun too, so it's fair game. It's also the easiest way to approach as the music is so loud, it's very hard to even say hi or whatever the opener...so it's mostly non verbal.
You would be incredibly silly to ignore the dance floor if you plan on getting lots of success in clubs.
Quick little tips: Learn to dance...no this does not mean take classes, look up youtube tutorials of simple dance steps in clubs and practice in front of a body long mirror at home. Ask you mom, she'll have one
But yeah you don't need to be a dancing monkey for girls, often it can be a hindrance. Learn to groove and feel the beat.
Don't waste your time and energy dancing with your buddies or dancing on your own to "seek social proof" or whatever. As soon as you're on the floor, select a target and dance over towards her and dance with her. If you get blown out, dance it off and approach straight away again. Rinse and repeat until you get something decent.
Assume physical contact instantly, spin her around is a good start and slowly escalate. Eye contact is massive...ignore everyone else in the club, and form an invisible bubble with just the two of you...this is very powerful...keep up the escalation, exchange minor verbals like name and maybe a sexy compliment, play with the verbal side but remember, it's the dance floor, not the public community hall meeting.
If you want to learn more, do a quick search of my dude skills360. He's the best dance floor guy I've come across and he's legit as it comes...I've learned a hell of a lot from him. He has several posts and threads on the subject.
-Dilla