Read it through once

There are, then, abundant materials waiting to be picked up by any who has the wit to see them lying at his feet and all around him. What is next required is the power of Selection. Can this be taught? I think not; at least, I do not know how, unless it is by reading. In every Art, selection requires that kind of special fitness for the Art which is included in the much-abused word Genius. In Fiction, the power of selection requires a large share of the dramatic sense. Those who already possess this faculty will not go wrong if they bear in mind the simple Rule, that nothing should be admitted which does not advance the story, illustrate the characters, bring into stronger relief the hidden forces which act upon them, their emotions, their passions, and their intentions. All descriptions which hinder instead of helping the action, all episodes of whatever kind, all conversation which does not either advance the story or illustrate the characters, ought to be rigidly suppressed.