Tips on how to give a good blow job

I’ve started seeing this guy and he’s really good at giving oral but he’s the first guy I’ve given a blow job to and I don’t think I’m any good at it. Whenever I give him a blow job, he always has me on my knees while he stands but I find I can work it better when he’s laid down; he never lets me finish him off because it’s more a warm up before we have sex but I want to please him like he does me. Does anyone have any tips???