Use these 10 tips to develop  your creative writing prompt . Here's a  story example  

Read the prompt multiple times and make a good understanding

Create a number of potential story ideas

Choose one of the ideas as your  theme

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Create main characters by describing them with name, background and personality. 

Sketch a rough outline of the plot with beginning,  middle and end

Introduce a problem that your main character faces and must overcome

Describe settings, dialogues, characters  vividly so that reader visualizes the story

Edit your writing for spelling, grammar, clarity etc.

Make final tweaks for smooth language flow, completeness and conveyance of the central message.