There are so many different kinds of writing and so many ways to work that the only rule is this: do what works. Almost everything has been tried and found to succeed for somebody. The methods, even the ideas of successful writers contradict each other in a most heartening way, and the only element I find common to all successful writers is persistence-an overwhelming determination to succeed.
For Writers Only (ed. Penguin, 2011) - ISBN: 9781101553770