Write every day. Even if it's only a letter.
The Creative Writing Coursebook: Forty Authors Share Advice and Exercises for Fiction and PoetryNovel writing is like heroin addiction; it takes everything you've got.
How to Write a Damn Good Novel: A Step-by-Step No Nonsense Guide to Dramatic StorytellingEverything you need to know about life can be learned from a genuine and ongoing attempt to write
Still Writing: The Perils and Pleasures of a Creative Life