Once you have a handle on playing chords and are able to switch from one chord to another, you should consider playing along to your favorite CDs. There are numerous Books on the market that feature the music of some popular artists and that have detailed transcriptions of the group's songs. Sometimes when you try to figure out the chords yourself, you get them wrong and then keep playing the song incorrectly. Try and search for your favorite artists' songBook and start from there. In time you be able to pick the chord changes out yourself.