I just found this post on WikiHow. It'll be a little obvious to some of the seasoned vets here, but I thought it would have some value, especially since the discussion seems to pop up every few months. The post is pretty sprawling and exhaustive, if not a little conventional. Nonetheless, some good steps and tips for the aspiring next great songfighter.
Check out the right-column sidebar for links to other related Wikis including "How to Sing Properly" (Obviously
not written by Zimmerman), "How to Start a Rock Band" (Share your weed), "How to Join a Band" (Share your weed), "How to Broaden Your Musical Horizons" (how about with a shoehorn?).
Here's the link...Now get to work!:
http://www.wikihow.com/Write-a-Song

Evil never looked so good.