Some writers have their ideas written, but have not planned out what happens when. They choose to go off on a tangin of their own. Sometimes, this is a great idea in a time crunch! But, ususually, planning it all out first is a better idea. Of course, your style is up to you. I generally suggest mapping it out. This brings us to...drumroll please...
First, refer back to your "Story Basics" notes. You have summarized your whole story. Break that down into five sections.I have an image for your reference.