Let Piano Blues make your left hand fly over the keyboard. From the novice and up, master the first, fourth and fifth chords for all keys on the keyboard.
Learn the 12 bar blues in all keys.
Select your key: C is easiest to begin with.
Select the style for each bar you play:
one - a single chord - get your fingering correct
pair - begin to speed up
rhythm/rhym - learn a boogie-style
walk - let your fingers perform a walking bass
wiggle - uses a greater range of notes
Select how bars change in the practice
I - only practice your root chord
I-IV - alternate between the root and the fourth
I-IV-V - alternate between the chords of the blues
12bar - go through the 12 bar blues sequence
Watch the notes on the keyboard and listen to the piano as you go. Progress through difficulty levels, from a basic single chord, through to a walking bass line alternating between chords for different keys.