I cracked and bought AirPods again. Help?

Hey yall. So I just cracked and bought AirPods pro again. Hoping to have a better experience with them this time. Not that they were bad in the first place, I just didn't need them as much as I thought I did back then, but as a college student now, perhaps I can get more uses out of them on the go.
I have a couple questions though, things I perhaps should've asked the first time.
First off, how do I get all the cool head tracking stuff to work with Siri and the like? I got spatial audio working way back when but if I'm just wearing one earbud, which I will probably do because transparency mode still feels weird to me, will it just... know that and play as normal?
Second, I know last time it was supposed to have Siri say certain things at certain times. I think I turned that off because it would tell me even about texts and start auto ducking things. Can I customize that?
I realize how totally inept I sound right now. My informal language and seeming lack of knowledge about anything aren't doing me favors, I'd just like to do better this time around.
Thanks yall!