I actually created the first book 10 years or so ago.
It, of course, started with an idea. I was actually reading another book and saw a short poem in it. That made me decide to try my hand at writing.
I love Christmas...it was always the most magical time for me as a child. So, I decided to start with that. Next thing I knew, I had the story written, and kept going to write 11 more (same series...it was my vision to release 1 for each month of the year).