Please," said Lirael..."I think I would like to work in this Library." "The Library," repeated Sanar, looking troubled. "That can be dangerous to a girl of fourteen. Or a woman of forty, for that matter.
Garth NixI 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 Nix