Work your way through the
Elementary Rudiments of Music.
Then download Guitar Pro, and start getting GP4 tabs off of
www.mysongbook.com or some other sweet guitar pro tab site.
These enhanced tabs usually have the accompanying instruments right in the tab file, allowing you to play along to the tune while practicing. (Although the sound is MIDI, it's still a very good practicing tool)
Once you feel you've accomplished something, you can click this link.
Probably NSFW