Help😬 I cant give head to save my life

I'm just really bad at it and really inexperienced, I've been with the same guy for so many years now, and I barely ever go down on him like that because it used to make me gag and I didnt like it, hes not a very sexual person either, but I want to make him feel good, and give it another shot. I really just need tips as to like...how??? I tried watching porn and it doesnt help, i cant deep throat anything for shit. I really need some good tips