Continuing from the last blog post, you should ask yourself which format do you think is best for your particular story? Then begin from there.
A good compelling story is very important, but characters are whats going to intrigue people to keep reading your story. The story will draw them but strong characters will keep them.
Having a strong story to guide your characters will stop them from wandering around without direction.
Never forget that your main goal as a writer is to create an emotional response in your audience.