Identify a character in your idea.
1) What does that character WANT?
2) What does that character need to do to GET what they want?
3) What are they prepared to DO to get what they want?
Superman wants to save the world, will go through a quest to save the world, and will, if need be, sacrifice himself to save the world. (Crap example, but you see where IÃ¢â‚¬â„¢m going.)