I would recommend taking a look at www.sportskool.com for any level ball player. It's Mike Candrea explaining the fundamentals and a few of the Olympic players demonstrating. The best possible time to teach excellent fundamental positions and movements is from day 1.
And they're free! If you want to buy them to have handy they sell them too!
Take a look at them online and see if you're able to explain based on his explanations to your age group.
So many great coaches equals just as many options on what works for you and your players!