Apple id
I have a Apple iPhone, iPad and Mac computer that was given to me. Do I delete that person’s Apple ID and create a new one for me?
iMac 21.5″, 10.15
Question marked as
Yes. Do the steps in these documents even though you are not the person doing the selling (it should have been done before you got the devices by the former owner):
What to do before you sell, give away, or trade in your Mac - Apple Support
What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support
Read:
How to create a new Apple ID - Apple Support
Set up your iPhone, iPad, or iPod touch - Apple Support
Set up your MacBook Pro - Apple Support
The process is similar for most Macs.