I opened a file for each chapter, then subfiles for each character. And another file for timeline. One hundred pages into the book and I just now realized that the timeline is wrong, therefore my description of weather. You guessed what I have to do next.
A writer friend keeps hammering that all this should be done prior to writing a book. She has a point.
Back to brainstorming the plot-line. Nothing better to do on a rainy day.