Do this by having the right side edge of the fabric and ruffle facing each other and sew the seam along the edge. (apairandasparediy.com)
Other aspects are pretty standard with the power button located on the upper right side edge with the volume rocker on the left edge. (mobilegeeks.com)
Pick up your first pocket and add a line of hot glue as close to the bottom and side edges as you can and place it back where you want it. (lalymom.com)