Based on my personal experience, id say gmail, you only need a domain I used namecheap without any issue. You register with that on google, some settings you set on namecheap , it guides you all the way then you pay the lowest monthly fee, I pay 5.20 euros per month for my company’s mail.

You set up a main email then you can setup any number of aliases for yourself I think, you can also create group emails and assign yourself to it

not complicated or hard, just don’t care enough: music, spotify is fine, especially on the family plan.