You need to have a big conversation what he means by domination, what is he into and what are his hard nos and ask yourself the same questions.
safe, sane and consensual are the watchwords.
Does he ‘just’ want you to be dominant in the bedroom or does he want to explore elements of submission, does he want to include elements of bondage and masochism?
What will this play look like and what activities will it include or what will it not include?
These all need to be discussed and negotiated. You can’t just flip the dynamics of the scene you had in your previous relationship or your personal understanding. You need to start from scratch, discuss and negotiate everything - for it to be consensual (+safe/sane) it needs to be a collaborative exercise.
With verbal domination, you’ve used the word ‘bitch’ there as if it’s a neutral starting point, but it may be a turn off to him as he may not want insults, or anything humiliating to be verbalised. ‘Bitch’ might also have other connotations for him that are turn offs/could cause harm. So again needs to be discussed.
Is it humiliation he’s looking for (if so in what context?) or ‘just’ power transfer?
The sweet spot is finding something that turns you both on. Matching the verbal elements with the physical activities.
Worth also flagging you’ll both require aftercare as normal after such a play session. Lots of things make better fantasies and don’t work or can be harmful to self esteem/wellbeing when acted out, particularly within the confines of an existing relationship. This is from both the dom and sub perspective - you may not like the dom headspace. So start small with loads of check ins and ongoing discussion about what worked/didn’t work.
ps - sorry if this comes across as bossy boots/fun vacuum.