Watch the ii V I vi Etude Level 3 online guitar lesson by Vicki Genfan from Open Tuning Handbook: Rhythm

If you're not sure of the strumming pattern, it's a good idea to start with that before you add the melody with the octaves. Once you bring in the melody, make sure you take time to "prepare" getting to the chords and back to the octave melody. Check out the new voicing for the vi (Bm) chord up in the 9th fret.