I found this article at WritersDigest.com, written by ghostwriter Kelly James-Enger, about achieving success as a ghostwriter:
It’s a great piece, very comprehensive and full of information you can use. Points I want to highlight:
1. As a ghostwriter, you focus on writing well. When the book is done, you don’t have to become a promotions machine. Your job is to move on to another writing project.
2. Kelly’s ghosting gigs have paid her $12,000 to $25,000 per book.
3. In a ghostwriter collaboration, the author — your client — has final say on what goes into the book. Your role is to write expertly in their voice.
The article also has a section on breaking in. I’d like to remind everyone that you can break in with smaller projects, too, from reports to articles to eBooks. One of my early gigs as a ghostwriter was writing health-related articles for a popular health information website. Start somewhere, and grow from there.