I have a system that worked wonderfully on my sword and sorcery series “Resurrecting Arel.”
One file is all scene description. The other file is the actual script.
I spent a lot of time fleshing out the story scene by scene. A few sentences of what happens in that scene.
Then, every morning, I’d write one scene. A scene in a comic could be four panels or four pages.
But every day, I felt accomplishment. Every day I was closer to my goal. If there were 10 scenes in one issue, I could finish the book in two weeks.
Theoretically, anyway. Those scene descriptions change as the story comes together.