I am thinking about setting up a VPN. One reference that seems pretty good (and clear) is

http://www.pcworld.com/article/21056...windows_7.html for Win 7

However one of the first steps is "Enter the IP address or domain name of the server to which you want to connect"

Question 1. How do I determine what server to use? Are there lists of such servers?

Question 2. Once I set up the VPN, can I easily toggle back and forth between using it and not? I expect to need to use the VPN only occasionally and would use my normal internet connection most of the time.