Try to learn a few of the basic chords....C, G, Am, F, G7. Play these chords, which are used in thousands of songs, slowly changing from on chord to another. I stress, play them SLOWLY until you make no mistakes. This will help to avoid "learning mistakes". Check the web for some easy basic songs that you know the melody and try to play them, again do it slowly. And before you know, you will amaze yourself!!!!
Have fun and enjoy the ride!!!!