I started out with a leather kit from Amazon. It was like $140 & had all the basic tools to get started.
Plus it had 4 colors of thread, beeswax plus some other stuff.
I made a lot of stuff with that kit.
4 inch Square double layer coasters. Tool 1 side or both sides. Teach them stitch line layout, the border layout, then the stamp pattern layout. Then glue & stitch the double sided coaster together. Can even make a leather coaster holder.