When I'm working out the story/novella, I do something similar to what Teresa describes which I think of as a shuffleboard collage of images, scenes, notes on histories, snippets of backstory, tunneling into each character. As I mentioned before (and I must get a copy of Blake Snyder's 'Save the Cat') I start at a very intense place, looking at a specific hunger, need, desire.
As I get to know the characters they become more complex or contradictory. Sometimes the desire changes, and then the plot takes off in a new direction. A big turning point is when there is conflict or collusion between characters, how they impact on one another. It is slow going though and when I get stuck, it is often because I have lost sight of a character or don't know where I'm going with an interaction. Then I go back to collage work, involve myself in a more random and free-associative way.
As I get to know the characters they become more complex or contradictory. Sometimes the desire changes, and then the plot takes off in a new direction. A big turning point is when there is conflict or collusion between characters, how they impact on one another. It is slow going though and when I get stuck, it is often because I have lost sight of a character or don't know where I'm going with an interaction. Then I go back to collage work, involve myself in a more random and free-associative way.