First trip to AC

Hey all, I'm about to head to AC this coming week, and I need a little info. I have checked about 20 pages of this forum, tried to use the search function, and checked the homepage for the Borg and the Taj, and still can't find out what the rake is. So what is it?
I'm familiar enough with online, but have never played live except for a profusion of home games. I have etiquette down ok, thanks to the first post in this forum.
Also which room should I go to?
Do you get comped for poker alone, and what other obscure conventions will set me straight for a decent experience?

Don't want to look like I haven't done it before or anything, it would be tragic for everyone to think I sucked!

Cambraceres