Cheerleading helppp! Scorpion!?

so i have my right leg splits downs and almost my left. I've been trying to learn a scorpion but i cant get it. im 16 btw. i dont get how you hands and arms right. when i try both my arms are over my left shoulder. i dont know how to go from there, like how to get my right arm over my head. also if you know any streches that would help! thanks!