Throwing Sinking pitches

Hello, i want to learn to throw a proper sinker and splitter, just had one question, when you release both of these grips when you go to throw the ball do you throw the ball backspinning it of your fingers when you release it or do you just thrown it? and where is the best place to aim your pitch?

RHP

The sinker is your basic two-seam fastball. The splitter is a first cousin to the forkball but is much easier to throw. The only difference between those two pitches is the grip; with the splitter you have the index and middle fingers just off the seams, maybe a little wider, not much—but you throw both pitches just like a fastball. And don’t try to aim them—or any other pitches, because you’ll end up missing the plate, throwing the ball in the dirt, and you don’t want to do that, now do you? You want to get those pitches in or close to the strike zone, and you want to keep the ball down, and whatever arm angle you use you want it to be free and easy. This should give you some idea of what to do with them. 8)