For testing purposes i would get a program called VMWare i use it regular in the class im in, what it does it that it creates a viritual machine on your system, so its a computer within the program.
You can get it here: http://www.vmware.se/
What you need to get going is a operating system, for this i recomend windows server 2008 there is a free trial on microsofts download center, that should get you going for testing.
If you really know what you are doing you could start looking into renting a server.
After a minute of googling i found a site that does just that: http://www.godaddy.com/hosting/dedicated-servers.aspx
Before you rent you should get your game working completly using VMWare though, you don’t want to pay money just to play around.