New WSUS 3.0 SP1 Server

Hi Folks

I have a WSUS3.0 Server and I would like to transfer that role to a new server. I already installed WSUS3.0 SP1 on the new server and ran a sync with microsoft. I wanted to test a few XP machines on the new server before transfering the whole office to it.

1- Whats the best way to do this and test it with a few XP machines first?
2- Did I already mess myself up by snycing with micorosoft? Should I have made the new one a replica of the old one first?

Thanks for the help