Step 1: Throwing Your Choice
When you are ready to throw your choice of scissors, paper or rock, make sure you don't choose scissors but you choose rock. The reason to this is because the most common is scissors, so most of the time the other player will throw scissors. If so, you win.
Step 2: What Else to Do
Next I can't help you at all so follow your heart into what to choose to throw. Good luck.