I wouldn’t say there are thing you must and musn’t do 
But there are things that might make your story more popular and likeable 
Here’s a thread I made a few years back Writing an Episode story 101 - The key to success
I think it sums up the most important things when writing a story 
If you’re struggling to come up with a title, I have a 
Story Title Shop as well
Good luck! 
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