So I wrote book 1 as a stand alone, but my agent said, if you were to write another book, what would happen? I wrote a two paragraph summary, and now I have THREE books to write. Fun? Most days. I love the characters and the world I've created, but it also intimidates the heck out of me because it involves plotting and outlining and... ORGANIZATION.
How do I know what elements to mention in book 1 that will be important in book 3 (the master example being JK)?
For those with sequels/series, did any of you write book 2 while revising book 1? Did book 1 change much once book 2 started flowing?