Blow job help?

I FINALLY was able to be at a place to both give and receive oral. However, I want to be better. I am asking my man just what to do to be better, and he just won’t say anything other than “no teeth”. (I may have accidentally caught him just once).

My gag reflex isn’t the best. So no deep throating. I know the “squeeze your thumb in a fist to prevent gagging” what else? Any tips or tricks out there?