I want to set up a new iCloud email for another business how do I do that?

This document explains how to create a new Apple ID (create an Apple Account) --> How to create a new Apple ID - Apple Support

You can create another account but your iPhone can only sign into one at any one time. You can, however, sign into either account with a web browser.

Not sure if your business is just you or qualifies as a Small Business, but Apple offers special support and resources for Small Business. Check out Business - Small Business - Apple