HAHA Firstly you are gonna have a great time!
I guess the thing I would say to anyone who has just come out is that your first experiences on the "Gay scene" are going to be exciting but don't loose yourself. Don't forget who you are. The people that matter will appreciate you more for being real than for fitting in.
I have seen so many beautiful people turn into monsters because they fell into the bitchy party scene. Go out and have an amazing time but do it with style and class.
There is a lot of pressure in Gay culture to look a certain way, act a certain way and be a certain person. Don't be fooled by this.
And finally remember...
All those funny old queens you see out and laugh at have already done everything you are about to do and have probably had a tougher time doing it, so respect.
And yes I am speaking from experience... I have been the bitch in the tight jeans sipping a cosmo but in the end I figured it out and so will you.
Good Luck and don't worry. You're going to be amazing!