YouTube Playlist
YouTube will probably look something like this when you first go to it.
Open the Side Menu and Click Library
You'll possibly need to open the side menu by clicking the topmost highlighted box. Then you can click on the word Library to be taken to your playlist library
Click New Playlist
Give the Playlist a Title and Click Create
Click on Playlist Settings
Ensure "ordering" Is Set to "Date Added Newest" Then Click Save
Click the Add Videos Button to Add Videos to the Playlist
Finally Select the Tab "Your YouTube Videos", Select the Ones You Want to Add and Click "Add Videos"