The six horizontal lines represent the six strings on the guitar. The top line represents the string closest to your lap, and so on. The numbers on the strings represent the frets to put your fingers. A '0' means that string is played open. Work the tablature above from left to right and you'll end with an Am. That's all there is really. The following are common tablature notations. E-mail me if you have any questions.

 

Hammer-On Pull-Off Slide-Up Slide-Down Bend

Pre-Bend Pre-Bend and Release Bend and Release Palm-Mute Harmonic