The main thing is to start immediately.
Don’t sweat the details. Start a list any way that’s quickest, list at least one good daily item on a piece of paper immediately, and improve the whole thing as you go.
You can add “improve list” as a daily task until your list method is in good shape.
Don’t be fooling yourself. You can definitely tell—you can feel it—if an item on the list isn’t quite right. Pay attention to that feeling, and fix the problem.