I need advice on Being on top (Riding)

So I'm 30, divorced with two kids (10yrs & 18mns....yeah I know right?!?) same father.. We were together for 12yrs and we've been divorced for 2. I started dating my boyfriend about 5 months ago and things are going great, awesome sex (now, I had a hard time opening up for a while) I guess because I was with my ex-husband for so long that I was completely open and used to having sex with him that I felt like a beginner all over again and felt very insecure in my abilities and appearance. but lately I have begun to feel comfortable, safe, open, and sexy again.

The only problem I have is that my boyfriend has serious back problems so missionary is not possible as well as some other positions. Doggy style is not a problem and my favorite position and he likes it as well, but his favorite position now because of his recent back problems is for me to be on top. My issue is that my ex-husband didn't like that position and we VERY rarely did it that way. So I have no clue as to what to do... I mean of course I know to get on top and go up and down but I feel so akward. like what do I do with my hands? do you go fast? how to you go up and down fast when your sitting straight up without killing your legs? do they like it if you get sit on it and let it go as deep as it can, because that's my favorite part but I feel weird just sitting there!

Basically I want to enjoy it as much as he does, which at this point I'm sure isn't that much..not that he doesn't like it's just very vanilla.. I need some pointers so we both can enjoy it and make it to the top of t i8he mountain. cause right now it's like I'm at the bottom looking at him on the peak and feeling like damn that's gonna be a

long hike! 😯

Ladies please teach me your ways because I've heard many women say it's their favorite position, but I'm just lost!

*Sorry so long, TIA*