Incorporate live wrestling throughout your practice. Kids like to scrap and can only absorb so much instruction at once, so break up your practice with segments of live wrestling. I often let my students wrestle a live match after warming up and doing some basic skill drills. It seems to settle them down and tire them out a little, and the result is that they pay better attention when I teach. Give it a try.
Live situations are also an essential training tool.
Utilize videotape for instruction and motivation. Beginners need to see what it looks like when a move is executed correctly in competition, and edited highlight tapes can prove to be very motivational. Teach more than just technique. The trick is to plan and conduct structured, reasonably intense practices, so that your students get good while still enjoying the training. Then they start to win and really enjoy the sport.