How do I get location notifications

You need to have turned on Find My iPhone.

See If your iPhone, iPad, or iPod touch is lost or stolen  https://support.apple.com/en-us/HT201472 and

Use Lost Mode in Find My iPhone on iCloud.com https://support.apple.com/guide/icloud/use-lost-mode-mmfc0f0165/icloud

Also see Find friends and share your location with Find My https://support.apple.com/en-us/HT210514