Want to succeed in writing? Look for help from the older fictional white guys you see in movies.  Advice #1 arrives from Albus Dumbledore of Harry Potter fame. Dumbledore has zillions of inspirational one-liners, but my favorite comes from The Chamber of Secrets: “It is our choices, Harry,” he says, “that show us what we truly are, far more than our abilities.”  The writing connection? In my experience, writing books…