I came across this 50-year-old documentary about Ray Bradbury from 1963. This is a great piece that follows Bradbury’s writing process from idea creation through story submission. This is Bradbury at his height, and well worth a look.
Another interesting article from Buzzfeed. Over two dozen authors offer no-nonsense advice for young writers. My personal favorites come from Neil Gaiman, Patrick Rothfuss and David Drake.