[joshmn]

Not OP, but someone who is very familiar with this space:

Hosting... Don't do some crazy VPS thing, you don't want to worry about being a sysadmin. Dreamhost has a good WP setup with most things you'd need ready to go. There are lots of other "managed WordPress" companies too.

Email, just FastMail or G-Suite (Google Apps). Probably just the latter because it's familiar to most.

Registration is pretty negligible these days. I like Namecheap and their corporate values and support.