Choking fantasy - advice for a first timer?

Hi! I (22F) have been talking to my bf about our fantasies. I’m still a virgin, and up to this point haven’t done much beyond french kissing/breast play, but I’m interested in the idea of being choked. In my last make out session with my bf he gave me hickeys for the first time, which is when I realised I really like my neck being kissed/touched! Thus the thoughts about getting choked arise… Context aside: does anyone have any advice for a total first-timer? As far as I know, my bf doesn’t have much experience either, but he said he’s happy to try anything as long as I’m comfortable with it and he doesn’t want to push me. Help is appreciated! Thank you.