erasing Macbook Air with Catalina to give away

I had trouble erasing my MacBook with Catalina (I want to give to a relative). Signed out of Music/itunes and messages but couldn't sign out of iCloud (directions assumed I had Mojave and nothing on internet could help me with Catalina) so I decided to restore to an earlier date (before Catalina) with Time Machine. All going well until it stopped restoring (didn't finish) but said I needed to reinstall MacOS. So I read up on that and it said before reinstalling MacOS, if I'm giving it away, to erase my disk, so I did and then reinstalled MacOS (no other choice but Catalina). This is where I am now, Catalina is installed and MacBook Air ready for set up. Before I give this away, I don't know if my iCloud account is still on it. How to find this out? Should I set it up and to see if it's there? And if it's there, how do I sign out of iCloud on Catalina and being erasing again?! What to do?!