What parts do I need in order to connect a light to my netduino?
Micah, since you are new I will try and help you. First off: are you familiar with the Netduino Forums? That would be a great place to ask a Netduino related question like this.

Next Google is your friend; perhaps the reason you are getting a less than stellar welcome here is that spending a few minutes searching with Google will yield many possible solutions.

The basic issue you have here is that what you need to turn on and off draws more current and/or requires more voltage than the Netduino can safely handle. That is why you are being asked what voltage and current. 

If you would like to switch a light that can be plugged into the 120 volt wall outlet, then this power switch tail will work with your Netduino.

Hopefully you will take a greater interest in learning about electronics and the many other things your Netduino can do. By reading through the questions and answers here you can learn a lot that can help you.

Finally welcome to this website.