If I put an older movie on the Watch List, and it comes up on a TV
channel, in, say, the next 6 months, will they notify me of this
upcoming date? That is what I am trying to do when I add movies to the
Watch List. Have them notify me when they are scheduled to play. Am I
doing the right thing?
No, Watch list is your list of movies which you're willing to watch. Once you completed watching that movie just remove the movie from that list. It's your list you are not going to notified from anyone it's your decision to watch.
Actually, you can't be notified but if you add a movie to watch list you can click on that particular title and on app there is an option Watch Now or on TV. I think you should explore the option and your problem will be resolved.