One way to get started is by making a chart. Use the following one as a guide.
Mood Genre Setting Character
Cheerful Romance Beach 7-year-old boy
Thoughtful Horror City 60-year-old working artist
Romantic Sci-Fi Woods 28-year-old teacher
Ominous Mystery Office Building 90-year-old veteran
Tense Fantasy Hospital 15-year-old athlete
Humorous Nonfiction Cruise ship 47-year-old Activity Director
Select one from each category, but you do not have to work across in a straight line.
Your task is to write a story using what you have selected.
Have fun with this one.