How do you write a Narrative Essay?

How do you write a Narrative Essay?
My question is can it be a made up story? or does it have to be something that has happened to you past or present something of experience. Because i want to write a made up story! What are the basics or format? My Essay has to be 1000 words THANK YOU!!!!

Narrative Essays

As a mode of expository writing, the narrative approach, more than any other, offers writers a chance to think and write about themselves. We all have experiences lodged in our memories which are worthy of sharing with readers. Yet sometimes they are so fused with other memories that a lot of the time spent in writing narrative is in the prewriting stage.