Every writer should be familiar with the term: bildungsroman.
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The term bildungsroman is generally used to describe a story which follows an individual’s journey from youth to adulthood.
You can subscribe to this word-a-day list here:
Some examples of bildungsroman are:
The Fault in Our Stars
Anne of Green Gables
Goodreads has a nice list:
Also, a teaching aid which you may find useful is the Storymatic Kids.
There are two types of cards. Your young authors pick one yellow card and one blue card. Voila! They instantly have a point at which to start their story.
There is an adult version, too.
Find it here:
Now, go write!