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There are lots of options for making part of your project move or rotate. Some of them are explained in their sections of specific Ag-ACS challenge modules, but if you don't want to search for them, they are here.
See the Chicken Coop module for details about how to set up and program the pneumatic system.
A motor shield fits on top of your Arduino, plugging directly into all of your pin headers to give you several terminals for plugging in a higher-voltage power source and multiple motors or servos. They make it much easier to wire and program tasks like changing motor speed or direction and often include libraries of customized commands that save you lots of lines of code. Shields can come from many sources for many purposes, not just motors.
These tutorials use motor shields from Adafruit Industries. Click here for more tutorial information.