Deleting .AppleSetupDone in /var/db/ will delete my iCloud account? I need to know that if I deleted the .AppleSetupDone file from my MacBook, is it going to delete my iCloud account too or is it only going to delete administration account?
The .AppleSetupDone file will not delete either the admin account or the iCloud account. See this article: "How to Re-Run the OS X Setup Assistant" This will just allow another admin account to be setup.