Just enter “coach to write a book” in your favorite search engine. This website, along with several others, will pop up on the first page of the results. As far as I know, all the coaches whose names pop up are professional, and have guided many would-be authors to the completion of their books.
But do you really need a coach? Perhaps all you need is a clear method. Now, far be it from me to discourage anyone from engaging a coach to write a book. But on the other hand, no coach that I know wants to sell you something you don’t need. I certainly don’t.
I suggest you get my free book, “The Simple Secret to Writing a Non-Fiction Book in 30 Days, at 1 Hour a Day!” Click here. Download the book and read it. Then see if you need a coach to take you to your next step.

