I actually have two little notebooks I keep by my side during simming, one for my legacy and one for my dynasty. In the notebooks is every single future heir and generation, all my plans for them, and then a section for storylines I definitely want to do and storylines I'm only considering. Then the next part of each book is current information, I write down when a sim skills up etc so I can keep track incase I want to mention it in my story or update the legacy's family tree, and while I'm playing I tend to jot down ideas while the game is saving about what I can say in the chapter or whatever regarding the screnshots I just took while playing.
Wow! This is really impressive!
I am writing a story, with an estimated 72 chapters. It goes over 6 years, and one chapter is dedicated for each month. I have the basic plot idea, and keep a unpublished post on my blog where I jot out what will happen in the months.
And when it comes to actually writing the chapter, I just copy paste the outline and start writing my story from the outline. Then, I play the game, and take screenshots. That leaves time for unpredictability. Then I add things up and finish up the chapter.
It really works for me, specially when I get stuck up on the finer details!
