First things first, only english support here...
Really much appreciated.
You have to that like with any other dedicated server too.
Edit the files.
REDIS is needed in order to run ATLAS itself, otherwise it won't run, you don't have to do anything about that.
This is not different than if the server runs on dedicated box so to speak on bare metal .
The Container does all on it's own (create the grid, add islands,...) and the server should be ready to join, you don't have to download the game itself or create the grid and start the server that does all the Container for you.
If you want to change anything you have to physically edit the appropriate files but please be sure to stop the Container first if you are editing a file.