Creating new iCloud account

Sign out Apple ID from iPhone / Mac https://support.apple.com/en-in/HT208242

And then create a new apple id address say example1@icloud.com see the section - Create an Apple ID using an iCloud address generated for you in the article https://support.apple.com/en-in/guide/mac-help/mh35903/10.14/mac/10.14

My wife and I share an iCloud account. I would like my own, how can I do this?

Is it a family sharing account or the two devices iPhone / Mac are signed in with same Apple ID and password on the same network .