On High bar, just try to get those lil guys hollow with their head in on the back swing and make sure they hop on the first tap swing ( if that's still in there from last quaddrenium ).
I like to teach a leaning front support to inverted candle for the undershoot. I spot this to insure there is no pike and the head is in and eventually they'll add a cast. However, pullup to inverted candlestick is a good drill but can be tough for many young L4's.
Getting them to keep their legs together on their 1/2 turn is always challenging. With some boys, the usual drills work and sometimes they just don't get it like one guy I had last season.
Rings is all about building swinging. Relax in the shoulders, keep the head in. Focus on teaching the swing in one direction at first and not trying to concentrate it on both ends at first helps.
We do hug the twinkies a lot ( lay your torso on a block and raise your legs past horizontal ). We also would do candlestick holds by holding the base of a beam or pommel or PB with straight arms ( head in ) and trying to just hold the candlestick perfectly straight. Eventually we would lower this diagonally until they could hold it horizontally.
Do a whole lot of walking on the p-bars and pommel horse besides skin the cats, etc. Lots of swinging and shrugging on pbars and supports on rings. It's very difficult for those lil guys to build a nice support on pommel.
Gymnastics Skills Index
has a bunch of video index for skills. Look into gymsmarts for men's basic dvd's or Greg Schram's videos though a google. Hopefully, you have the Compulsory DVD as well to kind of work things out as well.
Good luck. I had posted my warmup over at D&S in one of my posts and I may have broken down how many times I hit events per week and what duration.
I know when I was starting my boy's team, I went over to the other local gyms with both teams and just started taking notes and observing. I was pretty much on my own at that gym with very people really knowledgeable about MAG besides whatever resources I could get my hands on.
If you're limited in resources ( obtaining videos ), either check out youtube or drillsandskills and try to see their basics or I can possibly video some of the L4 stuff and drills.