Incorporating periods of review into your practices and repetitively drilling what you have taught is of paramount importance. Emphasize skill development . Do not rush to teach them more techniques than they need or can remember. Not only the stance, motion, etc., but also the Greco skills as outlined by Mike Houck in USA Wrestling's Greco Coaches Syllabus and some folkstyle bottom drills like hip heists and building your base. Often use games to incorporate the basic skills into your practice.
Shadow drill frequently.
Kids need to learn to control their own bodies before they can control someone else. Plus, everyone in the room is drilling intensely, simultaneously, rather than half of the guys being partners. Shadow drilling is fun for kids and good conditioning. Kids use their imagination well. This can help you lead into teaching visualization skills .