A writer is a person who writes. You do’t wait to write until you have something to write about. As long as you’re of normal intelligence and all your senses are functioning (though even this isn’t essential), you have all the material which you need. You don’t think before you write. Writing is thinking because it’s the arrangement of words, and words are the only possible medium of thought.
You must never wait for inspiration before you write. It isn’t that inspiration doesn’t exist, but it comes only with writing. I’ve never met any writer who waited for inspiration. One begins to write a novel with a conscious effort, by using what I’ll term-regardless of physiological accuracy-the front part of the brain.