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Strictly speaking, a curveball breaks more in the vertical plane than horizontally. Curveball masters can throw a “12–6” (think clock), purely vertical and do it anywhere from 70–90mph. More commonly, the ball drifts from 1–7ish, 2–8ish. If a ball breaks more laterally (horizontally), ie. 3–8, then it’s a slider, but thrown faster than a curve (80mph territory). If it just breaks laterally at more or less fastball speed (80–90), then it’s a cutter.
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a slider spins more toward the vertical axis and hence tend to move across the horizontal plane with a slight to moderate downward angle (otherwise it’s a fat pitch, not a slider) L to R from the vantage of the mound for a LHP and R to L for RHP. A great R hand slider will look like a fastball inside to a RH batter and wind up moving away and down from him so the catcher catches it on the low outside corner of the plate and the batter is completely fooled and half way back to the dugout by then after whiffing at it. A curve spins toward the horizontal axis so that the rotation produces downward force (bernoulli) and hence it “breaks” or curves more than “slides”. A great curve will break 12 to 6 or down the face of a clock. A great slider is more 2 to 7 for comparison. Both wickedly effective pitches when thrown in the right count and settings.
Throw the ball at half of regular speed to your partner when practicing. A really important part of throwing a curveball is ensuring that you get the direction of the spin correct and that you can repeat this at least 80% of the time. As such, throwing at half your regular speed is a good halfway point to get your action started but to minimize the variables you have to battle.[10]

I would recommend waiting until the player is 14 or 15 years old. If young players throw curveballs on a consistent basis at younger ages they can cause damage to their elbows and thus hinder the growth process. But it’s not only the fact that they are throwing curveballs at a young age, it’s the fact that they are throwing curveballs with improper mechanics that causes much of the damage. The key is to make sure they are throwing the curveball with proper pitching mechanics.
Doug Bernier, founder of Pro Baseball, debuted in the Major Leagues in 2008 with the Colorado Rockies, and has played professional baseball for 5 organizations (CO Rockies, NY Yankees, PIT Pirates, MN Twins, & TX Rangers) over the past 16 years. He has Major League time at every infield position, and has played every position on the field professionally except for catcher. Where is he now? After 16 years of playing professionally, he is now a professional scout with the Colorado Rockies. You should click to watch this great defensive play by Bernier

The athlete facing their partner will hold the KB Powerbands handle in one hand and raise their arm so their elbow is even with their shoulder and there is a 90 degree angle at the elbow. Athletes will move so there is tension on the resistance band and slowly rotate their hand forward, keeping the elbow and upper arm stationery. Athletes will perform a controlled motion for 4-5 seconds on the downward motion while maintaining a normal speed while returning to the starting position.

Don't worry about wrist motion; keep your wrist firm and worry about the angle of your arm. This will maximize bottom-left break if you are a right-handed pitcher. The side of your hand should always face the batter, and your wrist should always finish at your left hip (again, right-handed). Also, try to aim at the left shoulder of a right handed batter, as this is a good aiming spot for the break to be efficient. For more information, you can refer to this article: How to Throw a Curveball.
I hope you enjoyed and learned something from this compilation of the best baseball pitching drills.  I suggest that if you haven’t already, check out my Pitching Mechanics page.  It’s where I break down a lot of the proper mechanics in the pitching delivery.  You should also check out my pitching program if you’re interested in throwing faster and more accurate.