I had to teach 22 kids to play their ukuleles last month, and it was a blast. I didn't know what I was doing, but I just taught them C, F and G7 chords, which they marked with really little star stickers, color coded, and gave them a few songs, showed them how to easily strum, and they just took off with it. I am nowhere near a good uke player, and I couldn't carry a tune if I had a bucket to carry it in, but the kids were impressed with whatever I did. Have fun with it... the kids definitely will.
Dan