How to start a new Apple ID n delete the other one if your being hacked rn
How to kick someone out your Apple ID n make a new one without them loggin in and seeing it
Question marked as
How to create a new Apple ID - Apple Support
though everything from all your data to your purchased apps and games are tied to the appleId so it would be starting from scratch
personally if it was me the I would read this insted If you think your Apple ID has been compromised - Apple Support