Well if you have been practicing your basic chords now is the time to put some of them together into a basic progression. Roman numeral are used to designate progressions. The Root or key that you are in is designated the (I) or One chord. In this example we are using the Key of G major. The chords in the key of G major are:
G Am Bm C D Em FDim
I ii iii IV V vi vii
A Lower case Roman numeral means that the chord will be a minor chord in the same way that a lower case m beside the chord letter denotes minor.
This progression is called a I(one) IV(four)V(five) progression and is one of the most widely used progressions in music.
Included in this progression is a simple alternating bass line. Play this exercise slowly at first and make sure that all the notes in your chord are ringing with good tone. as you become accustom to changing the chords begin to play it faster