I don't do all the background and the worldbuilding before I start the story. What I do is I work out the bare minimum I need to start the story, and often that really is a bare minimum - it's a character in a situation, and I know nothing about the character, I know nothing about the situation, and then I think about it for a long time, and make notes about where I think the story is going to go and so on, but I don't really make notes to do with the background or the magic system or the world.
Garth NixIf only Sam could have stayed just like the Dog, she thought. A comforting friend without the complication of romantic interest.There had to be something she could do to completely discourage him, short of throwing up, or making herself totally unattractive. "I'm thirty-five," she said at last.
Garth NixKnowledge, like all things, is best in moderation," intoned the Will. "Knowing everything means you don't need to think, and that is very dangerous.
Garth NixIt is taken care of. Nothing will not break into my Pit or the Far Reaches! I cannot speak for the other parts of the House, but we have Nothing well in hand here. I understand Nothing as no one else does! - Grim Tuesday
Garth Nix