I want...

I want to write a book. Yes it is very ambitious. I really want to do it thought even if I have no idea how to go about doing it. I've written a few short stories and am wondering if I should continue them/expand them or if I should start a new story. If I start a book should I outline what's going to be in each chapter or if I should just wing it. Hmmm.... I should think about this. I know I can start to plan it during Thanksgiving break since I hopefully won't have much homework.