25k is not a lot
hands at all, so I hope you know what your getting yourself into. Make sure you just take things slow and don't be afraid to ask the floor man questions.
If your playing cash, sometimes you purchase your chips at the table and sometimes at the cage - just ask the people at the desk where you can do that, and ask them if you can jump on a list for "insert your game of choice here" or if there's a seat available.
If something sketchy happens at the table - call the floor man. It is a tool your allowed to utilize.
Make sure you get a players card if its available, and inquire about the bad beat/rakeback/house promotions etc.
When you sit down they'll ask you to post if it's cash - don't post, watch a hand or two and wait until your either a forced bet or can get free hands depending on the rooms policy.
Definitely eat well and make yourself comfortable, try to relax, nerves are really useless in a
gambling environment because they affect your decision making process in a bad way.
You just a guy at a table with wagering discs playing a game. By the way, play really tight at first but don't be afraid to adjust to the table dynamic - that's what good players do.