Look at the Star Wars series, particularly the last three chapters, which were the first three books. Take away the science trappings and what do you have -- a fairy tale with castles, wizards (Yoda and Friends) a maiden in distress and a hero.
Build a story based on fairy tales, soap operas, love stories, etc and then update it to include the science fiction aspect.
Or, make up a fairy tale, based on any scenario you can think up. Get a basic story line on paper, add characters, incidents, dialogue, etc. The revise, revise, rewrite and revise and you will have a story. Will it be a good story? I don't know. It will be as good as you can make it. Let me know how it is going.