"Guide to Moab, UT Backroads & 4 Wheel Drive Trails, 2nd edition" by Charles A. Wells. It's $18.45 from Amazon. This is the definitive text that lists all the trails with excellent descriptions, and ranks them all from easiest to hardest. Google Moab jeep rentals, there are several decent outfits. They don't want you to take their jeeps on the most difficult runs such as "Behind the Rocks" or "Pritchett Canyon". For understandable reasons. They do allow Hell's Revenge, and it's a must for the true Moab slickrock experience, and only takes 3 hours or so. Lots to choose from.