Maybe the NRA shooting safety video or something. As for "how to hit targets," trap or other, forget it. Find coach/instructor who has a lot of experience teaching kids to shoot, and who has the demonstrated ability to take kids who have never shot before get them to spanking targets very quickly.

Kids will not learn proper technique from a video. Heck, adults seldom will. They need a hands-on instructor o/wise all kinds of problems creep in.