Step 10: Load a program, and shoot all the things!
You are now finished! The only thing left is to program it. You can make it do whatever you want; writing HIGH to pin 13 is all you need to do to shoo...
Step 6: Setting up your Arduino
For this, you should have a 5v relay switch that is controlled by pin 13 of your Arduino, and you can set it up really however you would like. You could try to use my method just by looking at the picture, but I will unfortunately assume that you know how to use a relay with your Arduino.