I am getting ready to set up a home network. I have gotten a broadband router, and figuring that all I need to do is plug in all of my computers and it should work, and it does. What else do I need to do to protect the network that I will have. Do I need to set up some firewall software on my main computer, or on the router? What else do I need to do to keep the intruders out, and so that I have a safe network?