I've noticed that authors of extensive series will later on publish a book predating book 1. I'm town between inputting information about the world I built in the first book or go into more detail by making it a book itself. I'd like to put the information out there. Just not sure on how. Possibly a free novella, a full novel, a brief short story, or make it work in book 1. I do believe it would be helpful to understand the world I built, but I don't want too put too much attention on it and detract from the pace of the first book. Any thoughts?