Once upon a time.

Once upon a time there was this little kid named Tuck. He was the youngest child of the family. They lived in a farm far away from the city and people. The farm was in a valley surrounded by some hills, trees and a small quiet lake.

Tuck was a bright kid, every night he enjoyed staring at the sky wondering if someday he would be able to reach the stars, if someday he would be able to leave the farm and explore the world.

Then came a cold night during the fall, a night that would change everything in Tuck's life. As always, he was staring at the stars, imagining all the adventures he would have when he left the farm. His mother was in the kitchen cooking Tuck's favorite food. His father was still outside working with his older children. When suddenly...

________

To be continued :)

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"It was a cold night during the fall" - It would make sense to start a story with this phrase, but because you've already set the scene, you need to say something that makes it a little clearer about the temporal relationship.

When you talk about someone speculating in the past, you will normally use "would". "I wonder what I would have done if the police didn't get there in time."

I hope that helps; good luck with your story!