Hey, I'm new to Storyist and just saw your question about a book editor. I'm one of those -- from ghostwriting and developmental editing to fact-checking and copyediting -- I work with fiction and nonfiction authors. Be honest with yourself and consider how much you'll need from an editor. Many writers, especially new ones, require a lot more than polishing. Send thirty pages and ask potential book editors to give you their opinion re: what level of editing your story needs. Also, be sure to ask them if they work with The Chicago Manual of Style, the bible of publishing guidelines (very important!). Remember too: not all editors are created equal. Like many professions, it's often a mix of science (technical training) and art (creative instinct). Congratulations!