Before we get started, here are a few places around the internet that will be helpful to the emerging rocker:
Guitar Noise where you can find many of David Hodge's guitar online lessons, as well as the talkative and friendly GN Forums.
Free Jam Tracks is a place where you can find good guitar and bass backing tracks at a great price (free!) Pull up a chair, crank up a backing track and start jamming!
Thunder Row is for bass players, home of the fantastic Teach Me Bass Guitar DVD series featuring studio professional Roy Vogt. Lots of great articles, interviews, and the Thunder Row Forum. You'll need to be a registered member to get the most out of it. I hear there's going to be a Teach Me Lead Guitar DVD set sometime next year ...
Now, how about a little music to set the mood? Come on!