To divide up the hard task of writing the books, Victoria comes up with the actual storylines, and then Cherith and Kate take turns actually writing the books. The first arc of the series takes place at an actual forest in England. The last arc of the series, however, is at an imaginary lake. And the second arc, it's in between.
I actually got just wee bit obsessed with the Warriors series myself. I feel kind of a special connection with Warriors because I can't have a cat of my own. The Warriors series just really touched me. It was like having a cat when I was read these books. I never wanted to leave the world of the Warrior cats. It was like a second home for my heart.
When I first started the first book of the first arc, I hated it. Isn't that funny? Now I am doing a school project on it. Anyway, I completely despised it. But that was only because of the first books prologue. So, if you plan on reading the first book of the first arc, I recommend giving the book another chance when you read the prologue. Or you could just read the prologue after you've finished the rest of the book.
All in all, the Warriors series really is a great book series that many people everywhere read and enjoy. I know I sure do.