thought i was lesbian, turns out im bi, now what?

I recently accepted i am interested in a guy. I used to have a crush on him in high school, there was a lot that went on between us and i got hurt by him even though we never dated. it’s all forgiven and talked about, we were teenagers

anyways, 2 years ago he reaches out, we become good friends, and he asks me out on a date. i reject him, saying i’m gay, but about a month ago we went out for drinks as friends and i ended up giving him some mixed signals. after a long talk with him and my therapist, i decided to try and chill out, and give it a try.

i’m very clueless with guys, i don’t know how any of it works, ive literally never dated a man i’ve ONLY dated women. i tried telling him what i like but the dynamic is just so different. it’s like, he’s a very smart person but he’s also a bit clueless if that makes sense? but anyways, i guess i just need advice if someone else has gone through this. how does it work? how does SEX work? how do i deal with man things? what should i do to respect myself? i’m a bit scared of guys and i am mistrusting of them, i just don’t want to do something wrong.