How to prepare iPad Pro for resale

See: What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support (CA)

Settings > General > Transfer or Reset iPad > Erase All Content and Settings.

This will wipe the iPad, sign you out of iCloud Settings, disable Activation Lock, and complete an iCloud Backup prior to being erased. After erased, you should be good to go!

• What to do before you sell, give away, or trade in your iPhone or iPad