Alec,
Get this: "A Musician's Guide To Pro Tools" by producer John Keane. He produced R.E.M., Uncle Tupelo, Indigo Girls, etc. He's been using Pro Tools since it's inception. The book is simple, cuts to the chase, and has been priceless for me in the two years I've had PT. Then you can gradually get into the bible that comes with PT and get the finer points.