Hi Art,
There are lots of resources available online that you can print out. The American Topical Association website has the following on their youth page:
1. over 50 different topical album pages
2. an "Introduction to Stamp Collecting" booklet
3. Topical Tidbits is a newsletter with lots of activities. The Sept./Oct. 2012 issue is all about stamp collecting. The pages in this issue could be printed and used as handouts for teaching about tools of the trade, stamp nicknames, how to use a catalog, special service stamps, etc.
4. There will also be a 2014 calendar posted soon. This could be printed and used as a prize. The images for the calendar came from Nethryk, a member on this forum.
If you want an activity using covers, the American First Day Cover Society youth website has two sets of cover templates that can be used with either the gingerbread stamps or the Santa set from last year.
There is also a PowerPoint presentation for the Boy Scout merit badge. I use certain slides from this all the time to illustrate certain concepts when working with youth (not just Boy Scouts). This is in the youth section at
www.wfscstamps.org.One thing I like to do is have kids bring a binder. That way any handouts can go straight in it. I also give them one of those clear, plastic page protectors for putting loose items in. They also use the binder for their album pages, whether they are stock sheets, ones I've created (the ones on the ATA site), or just plain graph paper.
Good luck and keep us posted on how things go.