Remember that although you work out the history of a character and the reasons for things happening, you don’t have to include everything that you know in your story.
It’s tempting, especially when you’ve come up with such fabulous traits and explanations, but the trick is to select what needs to be in this chapter, what can be revealed later, and what can be left out completely. You want to include just enough to keep good rhythm and pace in the story, and you also want to leave some gaps for your readers to fill in the details.
Including too much information slows things down and the reader can get bored. But you still need to make sure you include ‘enough’ information for the reader to figure things out for themselves. Tricky, huh? That’s the writer’s challenge.
– Kathy White