I'd love to meet Stephen King and just pick his brain....
About the closet you can get to that is to read his memoir: On Writing: A Memoir Of The Craft.
The first part of the book is about how he came to be a writer. There are some hilarious, but also kind of sad and disturbing, stories of his childhood. Lots of entertaining stories about what sort of stuff he was attracted to, writing projects with his brother, etc. Very entertaining.
The second part of the book is specifically about writing, how he writes, what steps he goes through in creating his stories, how he gets his ideas (which he says it the most frequent question he is asked). This part of the book is pretty much advice to aspiring writers, but it's got loads of info about how he wrote a bunch of his books. If you're a fan of The Stand, for example, he goes into a lot of detail about that one--how he had to change the story while he was writing, because it wasn't working, and how he figured out why it wasn't working--because of the message he was trying to convey about human beings (and what rotten idiots most of us are). He also covers Misery pretty well, Carrie, The Dead Zone, a a few more.
This book is such a great read.
Oh, and there's an essay that was published in Playboy years ago called Why We Crave Horror Movies. He goes into his philosophy about why perfectly civilized human beings need an outlet. Great line from this essay: "If we share a brotherhood of man, we also share a brotherhood of insanity" or something like that. He uses these fantastic metaphors to explain why we are so attracted to horror and scary stories. We have to feed the alligators in our brains. This is one fantastic piece of writing that lets you kind of get into his head. I highly recommend it. Don't know where you'd find it now, but I found it in a textbook for college composition courses.
The books are pretty thick, but damn good.
i kinda felt bad for jake in that book , i mean his friend does get his head blown off right in front of him