Hm. I’d say…the most important thing I can think of, which is just keep writing. I have a friend who’s been working on a book for 4 years. I’ve read it. It’s not that good. It probably won’t be that good, if he ever finishes it. That’s OK. His 2nd book will be better. I hope he eventually gets there. And I hope anyone who wants to make it as a writer isn’t afraid to publish crap for a while.