newbie roll help

finally got the balls to just throw it but im def. doin something wrong here. when i land it feels like there is so much slack in the rope that its going to tear my arm off. any tips would be appreciated:

http://www.zafaranloo.com/gallery/wakeboard/z?full=1

try keeping 2 hands on the rope through the entire trick. And keep elbows bent and to your sides. that was what finally got me to do it correctly...I was getting slack caused by me releasing one hand and letting my are straighten. as a disclaimer there are those that are much more qualified than moi to give advice

When do you start your rotation at the top of the wake? or in the air?

The rotation doesn't look correct. As Patrick said, do the trick with 2 hands.

thats more of a mexican backroll, let the board drift more behind you. Don't throw your head toward your toes

Turn your head over you right shoulder...think of throwing the board up and over your right shoulder in an arch. You will be much more consistent doing them that way plus it will look better!