Begin with a review of your existing video content. Which formats and topics have you covered, and which have you missied? What's working and what isn't? A thorough audit will help to pick out the strengths and weaknesses of your current videos and suggest areas for improvement. Check out our blog post for a guide to conducting your own video audit.
“A series playlist allows you to mark your playlist as an official set of videos that should be viewed together. Adding a video to a series playlists allows other videos in the playlist to be featured and recommended when someone is viewing a video in the series playlist. YouTube may use this information to modify how the videos are presented or discovered.”