Tutorial Training on how to use Laser Engraving machines

I want to get into laser crafting. I have 3 diode lasers. I have found instructions manuals and online videos lacking. I'm looking for someone experienced in this hobby/business who can train me, as I don't want to risk ruining anything trying to learn to use them... (Budget: $15 - $25 USD, Jobs: Training, UX / User Experience)