find someone to show you few basic chords, the way to build chords and some basic theory n notes.
practice practice practice.
find out how to read tab (that's pretty easy). get tabs of songs you'd like to play.
practice again. practice again. practice again.
that's what i did and i'm happy with it. :)

p.s
never give up. don't get frustrated over some songs you possibly can't work out just leave'em alone for a while and get back to them when you're ready.
you're likely to find out that even after you practiced 5 hours in a row, your fingers ache like hell and you're bleeding over the strings you can't put your guitar aside.