There is a bunch of tutorials for this, but I didnt want to find one, here would be the code to make the MovieClip you want follow the mouse cursor:
var differenceX = mouseX - movieClip.x;
var differenceY = mouseY - movieClip.y;
var radianToDegrees = (Math.PI/180);
main.rotation = Math.atan2(differenceY, differenceX)/radianToDegrees;
tell me if u want me to explain it.