Dumb domain question.

Dumb domain question.

Actually It's two questions:

1 - I have a domain:  can I set up some accounts with this domain using zoho AND use some other accounts with another email hosting service?  What should I do to make it work?

2 - Can I use a domain for emails in Zoho while hosting my website in a different host, like Go Daddy?  What should I do in order to do this?

Sorry for the dumb questions.  Thanks for the answers.