I get all my guitar tabs from
PowerTabs.net. You use them in conjunction with Power Tab. Its a really nice program, you can print out the sheets, make your own music and of course listen to them.
I got my guitar about 2 years ago and have been slowly teaching myself just from simple songs. Very simple tunes such as begging riff of the James Bond theme and video game music were some of the first things I started to play.