There's a superb book written a few years ago by someone I knew, Phil Genova, who tragically died at an early age: First Cast: Teaching Kids to Fly Fish. Phil set up a superb program to teach kids fly fishing — and established the Community Fly Fishers, which was part of the Cornell Cooperative Extension program in Ithaca, NY. Later, he worked for Cortland Line where he set up and managed their PR and educational programs. His teaching program was also picked up by Trout Unlimited. Great first book.