Do You Have a Storyline...Are You Sure?

So, you think that you have that perfect topic for your short story or novel…you think that you have a good idea of what your storyline will be. You’ve written down some character names…You’ve chosen your location, your setting, and such…You’ve even started writing the first chapter…As you near the middle of the seventh page, you pause and look at the rest of the blank page…Wait a minute, what happened there?