Question of the day: I know I have writing in my blood. I can feel it. How can I turn this urge to write into a career? What steps should I follow? Once I have an idea for a book, what should I do to make it published?
Lots of "how do I get started" emails in my in-box right now - must be the New Year's resolutions! :)
How do you turn this urge to write into a career? Well, if you're talking about fiction - which I assume you are since you refer to a book - you need to start writing. Full stop. The end. So many people - too many people - believe that they have books in them. Guess how many of them actually take the time to write said books? Unscientific data tells me that it's at about 1%. Thinking that you have a book in you doesn't equate to anything - sitting down and writing it might.
Which leads me to your next question: how to get it published. If you're writing a novel, you actually have to have written the entire thing before you can even consider this next step. Once you've banged out, oh, 80k-100k words, and revised them, and revised them again, and maybe even revised them AGAIN (yes, I know, really), then you start looking for an agent. There are hundreds of great agents out there who are eager to sell good fiction, and you can start your search at Agent Query, Publishers Marketplace, google or the acknowledgment pages of your favorite books. You need to put together a bang-up query letter (you can search the blog for examples of some), email it out to dozens and dozens until one says yes. That agent will then likely help you revise the manuscript again, and then take it to publishers, one of whom you will also hope will say yes while offering you a check in return.
But getting back to my first paragraph: the most important element in all of this is sitting down and writing. I have a few close non-writer friends who want to write books - and who I think would all likely write very good ones - but they talk a lot about writing them without every writing them. You're never, ever, ever going to be a published author if you don't first write the book. I know that sounds obvious but for a lot of people, I'm actually not sure that is. Write the book. Worry about the rest of it after that. And good luck!!