Every story exists within a particular time period. Historical novels are normally centered in the past, ranging from the earliest days of man to the near present. Think cave men and last year.
Futuristic stories might be on Mars after its been settled, on a spaceship as it zooms toward a distant planet, or on Earth after an apocalypse.
When a story occurs affects weather, clothing, buildings, communication systems, all kinds of infrastructure issues and many more. If you’re an expert on a particular era, perhaps you don’t have to research to get information, but most of us will have to spend a substantial amount of time gathering data.
Your task is to write a story that takes place in a time period other than now. Begin by listing three different ideas that intrigue you. Choose the one you will enjoy learning more about. Research until you come up with enough information to develop your world.
Include sensory details so that your readers will grasp when and where the events take place, but be careful not to employ an information dump to do so. Weave together story and details, dialogue and narrative.
Have fun with this one.