Everything you need to hand out can be found on the geocaching.com web site. And there is a lot of stuff on this site.
We are retired teachers here in Arkansas, and from our experience I would suggest lots of "hands on" experience. Our young grandsons (ages 9-10) love to hunt for caches. So maybe hide more than one multi cache.
Have samples of several types of cache containers; travel bugs, geo coins, etc. Show some devious camo containers. Impress upon them the ethics of being a good geocacher.
I am new at this, just beginning last Feburary, and have already given two short seminars to adults to introduce them to the sport. Adults love the actual hunt too!
We are The Arkansas Travelers
Geocaching from Coast to Coast
"Home is where we park it"