I'll second not self hosting email unless you're in it for the experience.
I'd also strongly caution against hosting email for friends and family unless you want to own that relationship for the rest of your life.
If you do it anyway, you're going to end up locked into whatever solution you decide for a long time, because now you have users who rely on that solution.
If you still go forward, don't use Google (or msft). Use a dedicated email service. Having your personal domain tied to those services just further complicates the lock in.
(I did this over a decade ago, with Google, when it was just free vanity domain hosting. I've been trying for years to get my users migrated to Gmail accounts.)
If I had it all to do over again. I'd probably setup accounts as vanity forwards to a "real" account for people who wanted them. That's easy to maintain, move around, and you're not dealing with migrating peoples oauth to everything when you want to move or stop paying for it.