Easy ways to write a book include using an outline and employing stream-of-consciousness writing. Some people who have ideas worth writing about but are not polished writers retain the services of a ghost writer or a company such as Book In A Box.
One of the easiest ways to put pen to paper and move from a great idea to a polished piece of writing is to start with an outline. A writer takes something he knows, outlines on paper how he plans to explain it in his book and then develops each section of his outline into a full chapter. The aggregate of those chapters becomes his finished book. The outline method makes the task of writing an entire book less daunting by breaking it up into manageable sections.
Other writers prefer to use a stream-of-consciousness style, by which they sit down and type up their ideas as they enter the brain. While the finished product often feels more natural and honest than something written by outline, stream-of-consciousness writing requires heavy editing to ensure clarity.
Ghost writers are a great resource for an author with great ideas but limited writing skills. The online ghost writing service Book In A Box promises to turn an author's idea into a complete book in as little as 12 hours.