For the stones... Hang out at a local HS and talk to the Track & Field Coach. What you need is to work with a Shot putter. Trust me... I know it works. (former Shot Putter). You need to make sure that you follow thru with your throws. Legs play a big part too, dont forget to use them. Your non-throwing arm is just as important as your throwing arms. and Always look up and out as you throw.