Study writer's lives. Read The Paris Review interview and the Glimmer Train interviews and the essays by writers in The New York Times. What are the varieties of a writer's life? What are the perks in the career? Who is the boss when a person is a writer? Get more information about what writers do, how they tend their minds.
Read Publishers Weekly and other writers' journals. What's the difference between popular and mainstream? What's a genre writer? Who is who? Why? What does a day in the life of a successful writer look like? Most writers will tell you: lots and lots of days, sitting with fear and doubt.