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.