It is difficult to offer you suggestions on how you should throw it since you really need to be seen. Your arm slot, shoulder height, pitch grip and more comes into play. What you should do is have someone videotape you throwing the curve/slurve then watch it to see your basic mechanics. Videotaping should be done from the front, back and side. Though there are a number of books that can explain the proper grip, motion, etc., one of the best I've read is "Coaching Pitchers" by Joe "Spanky" McFarland. It's pretty easy to follow and understand. Another would be any of those done by Tom House. His latest book "The Art & Science of Pitching" is chuck full of useful info, but is somewhat difficult to understand since he deals heavily in the scientific breakdown of throwing.