Listen, watch, and read the Rock and Roll Hall of Fame biography of Little Richard. It's hard to figure out what's "official" on Little Richard online these days, but this certainly seems like a valid place to start.
This fantastic article about Richard's career and legacy gives you a great sense of his utter genius—and relative insanity.
DeCurtis reviews a new biography of Little Richard called Little Richard: The Birth of Rock and Roll, by David Kirby. The review isn't flattering, but it's fun to see how "Tutti Frutti" continues to be a topic of both debate and reverence nearly 60 years after its release.