Can you help me get email set up?

I started working with my broker this week. He’s 74 and often times I found myself having a difficult time following his train of thought. However, today it dawned on me that he wants me to be responsible for upkeeping the various accounts he has on online websites. That’s fine. I enjoy stuff like that.

Anyway, he left for Oklahoma, leaving me alone with some vague instructions, and it was up to me to puzzle them out, and I did. I figured out which websites and accounts, what their purpose is and, most importantly, how to access them so I can edit. (My broker just isn’t sure what passwords and logins go to what where and he kept looking in this really thick address book he has had since 1965, and trying different things, non of which worked…anyway, I teased it all out in his absence.)

One thing I need to do is set up an email address for me.

On his website it shows his email address as: John@DoeRealty.com.
However I finally realized it’s actually a gmail account, it just doesn’t say @gmail at the end.
I need to set up a similar email,
Dutchess@DoeRealty.com. ...and I’m kind of stuck on how to do that.

Yesterday he instructed me to set up a gmail account. I didn’t quite understand why then, but I set one up because he said to, but….it was just kind of a throw away account. Well, it logs me in OK, it’s a valid account, but it’s definitely not what I want. I don’t know how to delete that and start all over.

And how can it read “Dutchess@DoeRealty.com” when it’s a gmail account?

Any help would be appreciated.