I know this is kind of late, but if the kids are novice, I would just have all the drums you own set up on the very first day and have a bunch of copies of the book, then just let the kids get on a drum and run through an exercise or two, then have them rotate to a different drum. it's kind of letting you see what the kids are best at individually, so later on, you can let them go into subs and teach the desired technique/grip for each section. Obviously teh spots are going to be filled pretty soon and kids are still gonna want to play a specific instrument, so tell them to practice, so when you need a spot when someone leaves you are prepared. sprry if it doesn't make sense, i am in a hurry.
I hope this can help you, mike.