How can I achieve complete orgasm control?

I am a 30 year old eccentric male who has occasional intercourse and masturbates more regularly. Currently, I can last a while while masturbating through start/stop etc. It’s really down to my patience and schedule. I usually only last a few minutes during intercourse. I swing pretty wildly between fantasies of premature ejaculation and being able to last all night. I’d love to be able to accommodate both. I want to take off my pants with limited stimulation and I want to last till my partner is completely satisfied. What kind of exercises, habits, and techniques would you suggest to start this journey?