Inexperienced 20 Year Old Just Trying To Figure Some Things Out

Hi! So I'm in my first serious relationship (I'm 20 years old) and my boyfriend and I currently have a lack of reciprocation because he's done certain things for me, but I haven't reciprocated. And he's not pressuring me at all, he's actually really understanding and patient, but I want to give him a handjob or blowjob or whatever but I'm just a little intimidated by the unfamiliar parts... basically, how do you initiate a handjob? How do you go about it? And then do you continue until he's done or not and what do you do at the end? Sorry if this sounds stupid I just want to know a few basics before trying anything in real life. I want to give back to him I just don't know how! ☹️