I have read that some writers make a plan. I admit you have to have a plot, decide who your main characters are and make a rough biography of each one and have a setting in mind. But I find that if I had to lay out a plan of what was going to happen in the story from day one, I would be bored by too much knowledge – only a little is needed.
I want to be surprised. I want to know what makes them tick and why they act in a certain way and the only way to do that is to put them in a scene and see how they act. For example why does a character kill another person? How will he react to hearing what people are saying about the murder? In a way it’s like taking on the role of a psychiatrist and viewing their actions. It may sound crazy, but it makes writing so much more interesting and fun.