If you're a military brat, and have a parent in the service (Guard or otherwise), you probably don't need any advice from us, even the few of us with military experience. The core concepts of don't stick out, do what you're told, shut up and color, and make as many friends as possible are pretty much timeless.
A few more, which you may or may not find applicable:
Concentrate on the next meal, until you have a chance to sleep.
Don't try to argue with drill sergeants, or much of anyone else- if your drill sergeant proclaims that the sky is green and bacon grows on trees, keep your bearing and look straight ahead. Little known fact: drill sergeants are Vogons at heart, and Resistance Is Useless.
Above all, talk to people- anyone you can find- who have recently been through the course you'll be attending. You didn't mention whether this was Ft Benning, Ft Sill, Ft Leonard-Wood, etc. Get whatever facts you can.
Don't shun chapel time, even if you're a militant atheist. It's time away from barracks and therefore golden.
Again, let me reemphasize- don't stick out. The very best and the very worst get the most trouble. If you graduate with your sergeant unable to remember your name, you did it right.
Also, good luck. We're all pulling for you, in one way or another.
