Use Filters to find Videos, Playlists or Channels
Advanced Search Explained here
YouTube customizes your "start page" based on what it thinks you want to watch using your watch history, likes, your location and your subscriptions.
In your YouTube settings you can set notifications to send you emails about trending videos, videos from your subscriptions etc.
Create a YouTube Account
Go to Youtube, and then sign in using your Google Account. Hit the upload button and follow the prompts to get your channel up and running.
Search for Channels by Topic
Search for topics related to your teaching. Are there channels out there that look like they might be producing stuff you can use?
Start Subscribing!
Subscribe to excellent content (either my suggestions above, through search, or by browsing Youtube/edu
Check your Notification Settings
Get your settings just how you want them.
If you really, really, want to know all the ins and outs of playlists, here is an extensive post.Here is a link to a playlist where you can view the list in the order it is set to play along with any annotations that the playlist creator included.
Make a Playlist
Option 1: Surely you’ve got a list of links to videos that you like to use in your classes. Take a few minutes to dig out the list and start putting them together in a playlist. Try all of the editing features as well.
Option 2: Think of a topic that you'd like to develop a playlist for. Use your search and filter skills to find videos that might meet your needs. Add them to a playlist for you to review later.
Components of your Channel
Channel Housekeeping
Get your Channel setup.