Learning the IROCKU Groove Charts is the best practice for playing in a rock band!
Beginners: Play the chords in the first inversions in your right hand. Play the root of each chord in your left hand.
Intermediate: Play the chords in all inversions in your right hand. Experiment with left hand bass lines using the notes of each chord.
Advanced: Experiment by improvising using different scales in the right hand. The blues scale is always a great scale to work with!