Watch the Riff-Based Blues 2 online guitar lesson by Jeff McErlain from Blues Survival Guide: Rhythm Edition
The focus on this tune is keeping the right hand going. That is the support and the groove of the tune. We see this as a theme through out this course, the right hand is the propellant that keeps everything moving forward. As you can see I am mostly using down strokes to sound the notes of the riff, it think it is easier and sounds better. There are steadfast rules on this in many cases, whatever works and sounds the best is often the best route.