Great subject. I worked at the Scout camp for several years on the shotgun ranges.
We started the younger kids standing right behind the trap house-wasn't as intimidating as standing back at the normal positions. We have sporting clays also but that to me is for advanced shooters.
Always teach them to lean forward with knees bended. After a few shots they would see it was more comfortable and made sense.
Ask my son what a great teacher I was with him I never instructed him on any range after I realized how hard I was on him. We actually made a pact among us that we not teach our own kids.
We had standard shotguns and shorter ones for the boys. The gun has to fit the shooter.
Not teaching a newbie proper methods can result in a bad experience and possibly losing that shooter to our shooting sports forever due to 1 bad experience.
Thanks for a look back in time Brian