One of my favorite throwing drills from back in the day: https://pvybe.com/digital-dojo/disc-dog-foundation/modules/throwing/lessons/wall-and-pole-drill/
Also, check the sidebar (at the bottom on phones) for a bunch of throwing lessons from our Disc Dog Foundation class.
Forget About Grip and Bounce
Most of the Airbounce instruction out there in the disc dog world focuses on both the grip and the bounce. Your grip is fairly irrelevant and the bounce is counter productive in learning. It’s partly my fault, I put together a video in 2004 or so on throwing the Airbounce that was very authoritative, but not very elegant or effective instruction. It got a bit of ‘black market’ kind of circulation. I see a lot of that old technique in many frustrated discdoggers struggling with the throw.