Order the Redding's Study Guide for NFHS rules- it'll come out around May, I think. Honig's sells it or you can order direct from S&S Distributors. This book has helped me greatly in my rules studies. The new Rules by Topic put out by the Fed and available from Referee magazine is pretty handy too.
Work as many scrimmages/games as your new bride can stand
Experience is the best teacher.
I read once where Jerry Markbreit, former NFL official, studied the rule book every free moment he had, including bathroom breaks.
Pick out an official who seems knowledgable and helpful and hang out with him as much as you can.
If you go to Clemson games, train your eye on the officials and watch how they move and act. While their mechanics will be different since they are working 7 man crews, you can get a feel for how to operate.
Good luck!