http://one-shotstructure.blogspot.com/2010/10/16-climax-and-ending.html

READ THIS SERIES OF BLOG POSTS. ITS THE ULTIMATE ONESHOT HACK.
One of the hardest things is "This is just a oneshot- what do I put in and leave out? How do I intro the world well and not make the story too complicated?"
If you have trouble- or not, honestly, everyone should read this- go check it out!!! I'm so glad I found this!!!!!!!!