Markus Zusak interview at the Guardian.
From the Guardian:
What preparation do you do before writing?
I procrastinate in spades. In my defence, I also try to have all other distractions solved before I can concentrate on writing. My small theory is that to write for three hours, you need to feel like you have three days. To write for three days, you need to feel like you've got three weeks, and so on. Ultimately, though, it's the feeling in my stomach that's similar to the night before the school assignment is due...and you haven't started yet. That's my preparation.