ammosmith on youtube tends to a decent job. just realize that any of the advanced topics he discusses is prolly out of your league until you've been reloading for a year or five hehehe.
re: hornady reloading manual
I was going to voice a concern over pushing one reloading manual over the rest ... but...
I like my Hornady manual, I really do. I like my Speer's manual as well. There was another one I thumbed through but found it lacking... can't recall which. Pushing Hornady, since it seems to be a decent book... and by a local company... I guess I can't complain.
Forcing them to buy a manual is also awesome in that it sends them home with a wealth of information.
re: materials
$20 in materials fee sounds fine. Lighting some powder on fire to show what it does, hitting a primer with a hammer, etc. Destroying a case or two on purpose, or possibly denting one and then showing how to 'repair it'. Bullet pullers demonstration (kinetic hammer i suppose)... etc. And if they get to make a full box of 50 rounds - then $20 in materials might seem easier to swallow.
I kept a couple of my failed inspection brass. I'll hand them over when we meet up for the great brass caper
. I don't have any rifle brass to demonstrate head separation or head/web bulge failures though.