There are three servos.
One to control the turret's left and right movement (X Axis), one for the Y axis (up and down) and one to pull the trigger (T). Those 3 servos plug into a servo controller which is already included in the software kit.
That servo controller has a RS232 (Serial) port which is old and not found on newer computers so a RS-232 to USB converter needs to be used.
That plugs into the PC or Laptop and shows up as a com port.
The Windows version of the Acer Aspire One ($250) is very small and works great if you don't already have a laptop.
That's the big picture. Now for the details.
** You must have a video stream selected in Turret Control for data to be sent to the controller. **
Plug the servo leads and power in as shown below.
another view:
You can get the power leads from here: http://www.sparkfun.com/commerce/product_info.php?products_id=8672
When power is applied all 3 LEDs will blink once. When the controller is receiving data from the software the green LED will continuously flash.
In the beginning, just hook up one cheap servo to the X axis plug and test that. This way, if the wiring is wrong you only fry one servo instead of all of them. When that's working hook up the rest. You will need to pay close attention the the servos at first. If one is continuously trying to move to a position it can't move to it will get hot and burn itself up.