Tabs are tough unless you know the melody by ear already because they only contain the information regarding which notes to play and very little else about these notes. My best suggestion is to download a program called the Power Tab Editor. It is an extremely useful program that contains not only the tablature but also the sheet music for each song. Furthermore you can actually watch and listen to the song being played, kinda like on a TV show where the bouncing ball goes over the words to a song as they're being sang.

Once you've downloaded and installed this wonderful program head on down to the Power Tab Archive to search for any songs you need.

Hope that helped.