Hi Michelle,
Have I read it right - you are going to write a book?
I wrote a book a number of years back, and also won a grant to convert it into a film script.
At the moment, to give my life some purpose, I'm writing another book. My advice - map it out first. Get the chapter headings in place, and devise a kind of skeleton (fitting for AS). Because I can only stay on the computer for a short while, I think about what I am going to write, as in a chapter, or a few pages. Work it out in your head first, then when you can manage to type, you can just splurt it out. Let stuff just drop onto the page, and keep the flow going. Days later, go back and revise and edit. You can never revise enough.
Hope that is the kind of advise you were after.
All the best,
James