Well, editing the sprites is explained in my tutorial here. It's for mugshots, but it works for starter sprites as well. Just go to /a/2/0/2.
However, you won't be able to view the whole sprite correctly. You'll get mixed up body parts. I had to go in Photoshop and manually rearrange everything, piecing together parts like a jigsaw puzzle until I could get it looking right. Then when you're finished with your sprite, you have to rearrange everything back to the way it was before importing. It's quite time consuming, but it will work.