To setup a WSUS server on a workgroup server, you need to alter the register.

You can find the register keys here: HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\WindowsUpdate

AU register settings are in the key: HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\WindowsUpdate\AU

For more information on keys you can follow the next link: http://technet.microsoft.com/en-us/library/cc708449(WS.10).aspx

 With the command “wuauclt.exe /detectnow” you can let the WSUS server detect your machine faster.

Send the queued information directly to the wsus server with: “wuauclt /r /reportnow”