What is the name of the first warriors book?
The first warriors book was Into the Wild, but Bluestar's prophecy takes place before that book chronologically.
The first book of the Warriors series is into the wild. It is the first book of the first series consisting of six books. I would not recommend reading blue stars procey first, only because it doesn't explain about the moon pool and clan gatherings as much, in the first book these are explained in more detail.
Well, there is different 'chapters' of books in the Warrior series. First it's Warriors with 6 books, then Warriors: The New Prophecy which has 6 books also. Then there is Warriors: The Power Of Three with 6 books again, Warriors: Omen of The Stars with 3 books, and so on. To answer your question, the 7th book would be Midnight in Warriors: The New Prophecy.