Recently a patron asked me for information on how to publish some fiction he had recently written. Now, my first impulse was to take him to the 800s class - Literature and Rhetoric. "808" is instruction in writing, and "808.3" is for writing fiction (novels and/or short stories). However, it concentrates on the process of writing it; there is very little there on how to get fiction published.
For the best results in a situation like this, I recommend skipping the 800s altogether and going to "070.5," which is the section on publishing. You might not find a whole lot there that is specifically on publishing fiction, but you will probably find more information there about how to publish a book.
I hope this is helpful to anyone who works in a public library.