Welcome aboard Jersey Jack
One of the guys in my writing circle had trouble keeping his stories going, until he tried, ‘writing the ending first.’
So now he writes out the ending. Then goes back to where he feels ‘is a good starting point’ for the story. After that it is a matter of building up obstacles for the protagonist to overcome, until he feels he has reached ‘The End’.
It took him fifteen minutes to explain it to the rest of us, and mostly we agreed that it seemed to work for him. As for me, because I have extremely short blocks of time for writing, I find it best to just write modules as short stories and then weave them into a book.