Adam, welcome to the forum from Illinois!
I was in a similar position many years ago when I was teaching high school automotives and welding. There was a point where the Discovery Channels literally blossomed with motorcycle and hot rod shows featuring hand and custom fabrication, and my students were inspired. I was formally trained and experienced in metal
forming, and collision repair, but suddenly had to learn
shaping on my own, to share with my students.
Thankfully, the WWWeb was just blossoming at the same time, and I stumbled on Kent White's site, and also an early forum
http://metalshapers.org/ that sadly is not nearly as active now, but there is still archived info there. Thankfully other forums like this one have come along and are very active currently.
I did have a school budget that allowed me to purchase AV media: VHS and later DVDs as formats changed. If that money is not available to you, or if you want to preview some materials, try here:
https://smartflix.com/store/category/20/Sheetmetal
At the time there were already a few metal shaping books or books that had chapters on shaping, already on the market. They are still in print, and there have been several excellent new ones authored recently.
There is a wealth of info ideally suited for beginners on this forum, you just have to dig a bit.
As far as free print, I suggest this primer, it's been posted before, I think it's very good for students in your position:
http://www.knucklebusterinc.com/feat...abrication.pdf The beginning covers forming, then it does go into basic shaping techniques around page 25 or so.
For inspiring the use of simple tools, you might show your students these short video clips:
High speed bullet train noses shaped with hand hammers:
https://www.youtube.com/watch?v=FZNFsbDDOPs
Another craftsman with wonderfully simple tools:
https://www.youtube.com/watch?v=bCpHhRiyuM4 it's from this thread:
http://www.metalmeet.com/forum/showthread.php?t=11042
As you say, youtube video searches yield almost overwhelming results, but there are many gems to be found.
A formal pdf courtesy the Iowa taxpayers: