Set yourself up with a 'hydration schedule' before going in... that's the key advice I have to give you about going into the Air Force (which I happen to be in), and be really patient.
As for my own military background, my whole family has had military background one way or another and my geneology for my military heritage extends back thousands of years.... so I can give you as much information as I have had going in.
And last but not least, your recruiter will lie to you in one way or another and whatever your recruiter puts into contract, get a copy of it for yourself... it can mean the difference between making 700 Dollars a month and 1400 Dollars a month.