Step 1: Get a knife or star
Step 2: Throwing the kunai
throw #1 spinning: this one is pretty self-explanitory
hold the kunai and put it in the spot you feel most comfortable throwing it (for me it is over my shoulder) and throw it so that you let go when your arm is at a 45 degree angle and follow through.
throw #2 the drill: get your kunai to spin like a drill
set up so that your hand is at your thigh and bring it up and forward, it should spin like crazy
throw #3 the straight throw: this is how the real ninjas throw this stuff
you set it up the same as in #1 only this time you let go at a 90 degree angle and you don't follow through.
Step 3: How to throw a throwing star
step1 you take the throwing star and hold it a little away from your body
step 2 now curl your hand in like your trying to touch your forearm with your hand
step 3 now spin it