Most of my guitar students are from about third grade and up. Smaller guitars are available for younger students. My preferred guitar book at this time is “Guitar Sessions” by Kevin Dailey. I like the approach of this book primarily because of its emphasis on learning to play by note rather than just teaching chords. I believe it is important for students to learn to play melodies and learn chords at the same time. Their ability to read music is strongly enhanced by using that kind of method. The book also has a CD that can be used with many of the songs as an accompaniment.