Seeking advice about becoming a mommy domme

First off, im extremely inexperienced with any bdsm and not much more experienced with vanilla-ish sex. I currently have a very soft d/s online relationship and we're meeting up soon so things will be taking a massive leap in a very short time. In our main dynamic, I am the sub. But he's had experience with dommes before and every so often likes to incorporate that. I've basically been stumbling through the phone calls, but he seems pleased enough. I know for sure I'll do better in person when I can be active, I do have a natural knack for being the caring mommy type. I do have one scene id like to try. However, I really want to go in as prepared as possible so I don't falter as much when we meet.

So any tips/ideas anyone can give to help a super newbie would be massively appreciated. My instincts run to being sweet and caring during play, so im trying to find a nice balance straddling that "mommy" and "domme". Some things he likes include a bit of a foot fetish, some impact play, he's trusting me in trying some anal/prostate play for the first time, and i believe very gentle degradation.