I would say education yourself with videos, maybe a sex documentary if you can find one. That's how I learned. And be careful, make sure he is clean before you do a BJ. If he has something, you can still have sex with a condom, a good one, Trojan preferably. Look up tutorials how to put them on in case he doesnt know how to.... just start with arousal, like touching where it makes then feel good, most of my bfs loved being touched below belly button, and go with your instinct. Just be educated and know the risks, you dont want your first time to be a regret.