Student access to Youtube - for student protection, basic settings basically make Youtube not work UNLESS they are logged in to district Google account. You can approve videos that are not yet watchable by Garland ISD - BUT it gets approved for all students, not just the ones in your class. You can remove approval once your unit is over in case you don't want younger students to have access.
If you approve your Youtube channel for garlandisd.net, then any videos you add to playlists, even if they're not yours, will automatically be approved and be watchable.