I'm a lefty too. It might help to think of the back of the ball like a clock. Doing what Nellie just said, you start hitting the ball at 5 o'clock and finish around 11 o'clock. Note that you let the ball drop a little more than you would for a flat serve. The other important thing is at the finish of the contact you start to snap the wrist. This puts that extra "kick" in the kick serve.Toss over your head/ over your right shoulder, swing with a path that is parallel to the baseline and going up to the ball at contact (helps to keep your shoulders from opening by showing your back to the net).
It also helps to think about brushing up the right, outside edge of the ball.
Hey LeeD, maybe I'm not doing a real twist serve? My 2nd serves usually jump away from my opponents backhand with a small kick, much like Nadal's serve. I use a EBH grip for my second serve. I was taught that this is the easy 2nd serve, and the pure topspin is harder since it is thrown almost over the head, where my toss is still a little to my left. Maybe I hit a topslice serve? It was actually the first serve type I was taught as a kid because it is so easy to hit consistently and as a lefty this spins away from my opponents backhand. I know its not a pure slice serve because it clears the net by a good margin...er dude...
OP is a LEFTY! You are telling him directions for a rightie!
Lefty twist is duece court out wide, ad court up the middle. Since lefty ad court wide top/slice is very effective, forget the ad court serve up the middle.
Since I stand with a CLOSED stance while serving, toss is behind my head, not off to the right or left.
Swing directions are spot on, thos.