Check out these ebooks and interactive tutorials. If
you learn one thing you didn't already know, or if it reinforces something you already know then it's worth it.
They're ideal as gifts for kids and teens who may or may not take to playing a musical
instrument.
You may just want to get one to use as a model for your own instructional
program. Even just the pages that these link to have useful information, samples and trials if you're just browsing.