I know this sounds obvious and so basic that it doesn't even warrant mention, but so often writers ignore asking this up front and therefore miss giving that new potential idea an initial structural shape that can be built on in imaginative ways. It's often the trigger that opens the storytelling floodgates, allowing for the creative development of a new idea.
Every story involves a journey by the central character from one place to another and the most powerful stories always have that character go through some sort of sea change. In other words, he or she is a significantly changed person when they arrive at the story's destination.
Think of an arc, a trajectory that the character is moving through, starting with the early set up of the main dilemma, then the intensifying struggle to deal with that dilemma, and finally landing at a place of resolution. And it's having an early handle on how the character is a changed person when reaching the tale's destination that allows for it to initially take root and grow in your mind.
Of course this landing place can change and often does as you develop an idea further. However, this early focus on how the character is significantly changed (or might be changed) by the end of your story is one of your strongest launching tools as you enter the story development process.
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I'm the Program Director of the low-residency MFA in Writing for Stage and Screen being offered by the New Hampshire Institute of Art. Our last residency ran from June 22 to July 1 and we're current considering applications for starting the program next January at our residency scheduled for January 5-14, 2018. If you're interested, email me at firstname.lastname@example.org and we can start a dialogue.
I'm also a playwright and screenwriter, producing partner in my production company Either/Or Films (The Sensation of Sight and Only Daughter) a professional script consultant, and the author of The Playwright's Process. You can follow me on Twitter @eitherorfilms or @mfastagescreen. I’m also on Facebook at buzzmclaughlinscriptconsulting.