How do you write a book?

To get ur story going u need to add some part of ur thought that is not included in the plot...a small story that keeps the story going and some twists and turns for the reader to get interested....or think tht the main protagonist is u n think wat u will do if u were in tht situation n start writing anything tht comes to ur mind slowly slowly it will be a gud story to continue n maybe one of the bestsellers...