So I looked for other tutorials and here are two that I really like:
Easel card tutorial at Stamping Moments
This card starts with a 12" x 12" piece of cardstock cut into three 4" x 12" pieces (you have pieces for three cards).
Easel card tutorial at Splitcoast Stampers
These directions are a little different -- same result but different approach. You start with one 4 1/4" x 8 1/2" piece of cardstock and one 4 1/4" piece of cardstock.
Below are a few of my easel cards: