quick things
1. GET AAA, I'm serious, it's bailed me out so many times, it's not even funny.
2. Get a sound system, if you're on the road for as long as it sounds like you are going to be, tensions are going to flare up from time to time, and tunes can relax everyones mind so theres no awkward silences, or forced conversations.
3. See if one of your friends or your library has Rand McNally Tripmaker, it's pretty old school, but it will chart a course for you, and give you something to go with. It also will give you mileage, so you can calcuate about how much you will spend on gas.