Congratulations on a successful performance! When it comes to picking a method book, you need to look at your specific program. How much time are you going to have with the kids and what do you want for them to know by the end of the year? Once you know the answer to those questions, then you can look at methods. There has been an explosion of method books in the past few years so you have several options. I am fortunate that I have build up a library over several years so I use several different methods with my classes.
Hal Leonard has a couple of good method books: Guitar for Kids (geared at elementary) and Essential Elements which can be used for elementary, middle or high school.
Alfred has Jerry Snyder’s Guitar School.
Class Guitar Resources also has 2 method options. First Year Guitar is a full year class and Explore It! Guitar and Style is an exploratory method for a shorter period of time.
These are just a few options. Looking at them will give you the best idea of what you will like. I haven’t found a book that teaches guitar, bass and drums together like a band method.