Hi Flump,
You can't play SPWW2 "on line" per se, but can play by e-mail, which is probably what you meant.
I recommend you post on The Blitz wargaming club for an opponent:
http://www.theblitz.org/message_boar...lay.php?fid=14
They even have mentors there who will help out beginners.
Cheers,
Cross