Krotos,
I would echo The Walrus' advice - join a Ladder, and start playing PBEM. Once converted (perverted?) over to the Dark Side, you'll become an addict. ;-))
In addition to the Blitz, you may also consider joining-up at the StrategyZone Online site:
http://sp.xtreme-gamer.com/
Here, there are separate ladders for the 3 main incarnations of SP: SPWW2, SPWAW and SPMBT
John