Research should be involved in all novel writing, whether fiction or nonfiction.
“Nothing trips up an author faster than the idea that writing is a single act, completed in a single attempt, rather than a process. Where and when the belief began is irrelevant; what matters is that it is wrong. Today, we are going to dispel the myth and explain how a manuscript is created.”
Want more help? Check out Bird by Bird: Some Instructions on Writing and Life.