The internet has become a great resource for authors—you can type in “ghostwriter” or “book editor,” and you’ll find dozens or even hundreds of freelance editors who might be able to help you. Of course, you’ll need to narrow that down in order to find the editor or collaborator who is right for your project. What I suggest is contacting several of them and asking for lists of books they’ve worked on in the past to see if they’ve worked on anything like your book before. You can also talk to local librarians and booksellers, and they might be able to recommend people in your area. If you’re involved with a writer’s group, that’s another great resource for finding out about local book doctors who could potentially work with you on your project.