Most songs have meager beginnings. You wake up in the morning you throw on your suspenders and you subvocalize and just think. They seem to form like calcium. I can't think of a story right off the bat that was that interesting. I write things on the back of my hand usually and sing into a tape recorder.
Luck? I don't know anything about luck. I've never banked on it and I'm afraid of people who do. Luck to me is something else: Hard work - and realizing what is opportunity and what isn't.