With innumerable writing resources available on the Internet, I could put off actually working on my novel preparation forever.
Down with distraction! Having only a week and a half to plan, much of which is going to be busy, I broke down and actually used one of those character sheets that various writers recommend. This one appealed to me because it asks me to write in the character's voice, but there are others:
A shorter one found on Associated Content
Or, if you prefer, there are exercises (I wouldn't be much on the New Age undertones, but the exercises themselves look interesting.)
I have copied the character sheet into a document. My protagonist had already written all of her answers, but I have other characters to get to know. Her brother is a little more apathetic, and I haven't gotten around to speaking with her best friend yet.