What I do now is think up a problem and a resolution to that problem. I then begin the story, making it up as I go along, having all the excitement of finding out what will happen to the characters and how they will get out of their scrapes, but working steadily toward the known resolution so that I don’t get lost en route.

When asked for advice by beginners, I always stress that. Know your ending, I say, or the river of your story may finally sink into the desert sands and never reach the sea.

~ Isaac Asimov