I have this t-shirt I wear that says...
“There is nothing to writing, you just sit down and open a vein...”
WhenI used to sit around with my musings, scribbles and scraps, this was just an amusing anecdote that I thought thoroughly described the ‘drama’ that appeared to surround scribes of all professions. Then I wrote my first novel, and it wasn’t so funny anymore...because it’s true.
There are basic steps to creating a book, and everyone who writes one or teaches others how to write one, has their own variations of those basics which usually includes: an outline (of some sort), a list of characterization(s), a summary of the book, and the body or manuscript.