I'm a youth coach, and most of what we instruct in the US comes from Folk Style...hand fighting and shot setups with overhooks/underhooks, and collar ties, moving your opponent, etc are all key in winning position over your opponent to score the take down. All of this translates well in Freestyle so it's not a big leap for them. Once the opponent in down, we're teaching forward pressure and hip control. Once they get these fundamentals down, then you can teach the leg laces, far arms, tilts, etc.
What we struggle with is teaching Russian ties and joint control (at least in my experience). Greco is extremely difficult to teach youth due to the throws and slams. I recently purchased a throwing dummy from Suplay.com to teach the kids more throws. We'll see how that goes.