First: Be sure you have your "gay card" ready at the door, or they won't let you in.
Second: All of the hot shirless bartenders will want to sleep with you. Believe that.
Third: Learn right away to complain about the music, whatever type they play, even if you enjoy it.
Fourth: Form instant judgements about various segments of the clientele, e.g. the older men are pervs, the younger men are rude and superficial, the women are fag hags (unless they're bull dykes).
Fifth: Expect that just by walking in the door people will rush up and talk to you. Don't bother to introduce yourself or make any small talk with anyone. Then you can leave and tell everyone how stuck-up and phony everyone is.
Sixth: If you are an average looking person, get furious if the hotties aren't all over you, while you ignore the other average looking people, because they aren't hot enough for you.
Seventh: Ignore the more feminine men and the drag queens, and just wait for a "straight acting" guy to walk up to you and propose.
Eighth: If someone walks up and starts talking to you or asks you to dance, blow him off, in case somebody cuter comes along.
Ninth: If you meet someone, don't think of them as a potential friend, but rather as a potential hook-up.
Tenth: After following all these rules, leave and tell everyone the next day how disgusting the people at gay bars are.