Hi BenignChaos,
Congratulations!!!! Hahahah thank you very much for putting the effort to beat the devil out of Grimble. He is real tough, yeah, even I could not beat him in one of my playtestings. Those tutorials that I cited are specifically about turn-based, so if you want to make smt similar to those, you are more than welcome to check them out. But if you are aiming to make smt else, I believe the official GM channel also does provide all kind of vids for beginners, and other channels as well. So yeah, try them all out and see what fits you the best.
Thank you very much for playing the game!!!