After many years and many parties let me say this. Being new try to avoid the lineup. You will be overwhelmed, I was the first time. Now if some other guy gets a line up, go in and sit in the back and observe. That will be an education for you, plus you get to see all the ladies.
Do not worry about talking to the ladies, they are there to work and will seek you out. But try to talk to as many as you can, get a feel for them, then make a decision. It is best to go for the best attitude. Looks, body parts, hair , etc. may be a personal fantasy, but attitude will be more fun.