Okay, when you say learn guitar do you mean learn guitar or make something sound decent?
If you just want to make it sound like you're playing a song, then learn any nirvana, blink, punk, or any band where the members are all under 21. Guaranteed you'll be playing their songs in 10 minutes.
If you really want to learn the guitar and play most of the music out there then do 2 things first, and then go looking for some tabs.
1. Learn the blues minor pentatonic scale (used in virtually every rock/blues song ever made, and most country too I think). It's simple. Start at the bottom and go up the strings:
e---------------------------------------------0--3--0-----------------------------------------------
B--------------------------------------0--3-------------3--0---------------------------------------
G---------------------------0--2--3----------------------------3--2--0----------------------------
D--------------------0--2-------------------------------------------------2--0---------------------
A---------0--1--2----------------------------------------------------------------2--1--0----------
E--0--3--------------------------------------------------------------------------------------3--0--
This is in E as your first note is an E. You can play the A minor pentatonic scale by starting at fret 5 and going 5,8,5,6,7.... etc. The positions are relative. The cool thing is once you nail down the key of a song, you can mess around in that scale and it'll sound good.
2. Learn the 12 bar I IV V progression. This is huge in country and blues, and much of classic rock.
I IV I I
IV IV I I
V IV I V -- each I, IV, or V indicates one bar of playing
That's it. Let's say you are playing a song in the key of E (99% of the time the first chord of any country/rock/blues song gives you the key of the song). Your I chord is then E, your IV is A, and your V is D. So your progression would look like:
E A E E
A A E E
D A E D
Upshot here: If you can figure out the first chord of the song, chances are you know the key of the song and can mess around with some solo stuff while it's playing. You can also now figure out what the rest of the chords of the song are by using this progression.