Well, learn how to tune your guitar properly first. Then get an electric tuner to make it easier later.
Make sure you know all your chords fluently, practice some scales. Once you have that behind you, go to a few guitar tablature websites such as olga (
www.olga.net), punk hardcore (
www.punkhardcore.com) and mxtabs.net. That should have you set.
First learn a few easy songs. And then take on something crazy you'd never learn easily, like Stairway to Heaven. Something to keep taunting you as you learn, and to keep you motivated. Learn Time of Your Life by Green Day, good for practicing picking and easy chord changing.
Don't get distracted once you learn songs though. You'll be like wow, I can play! But trust me, learning how to actually play the guitar first is far more important. I only learned a little bit and then I learned a whole bunch of songs, and I'm stuck at being not very great at actually playing the guitar, even though I know a lot of songs to just play. That's not great.
Make sure you have good posture too. I don't know how to explain it by words, but there is such thing as good posture and it is very important. And make sure you use the right fingering for chords and such. Try to use all of them regularly so you don't struggle when you suddenly have to use your pinky in a song.
Well, good luck...