I'm a paradox fanboy, and come from HOI2, EU2, and Vicky. I recently picked up crusader kings essentially for free, and I've heard some good things about it, so I want to give it a shot.
I started a game as Byzantium and figured out pretty much immediately that I had no idea what was going on! I looked around for a Wiki, but it seems that paradoxian doesn't carry it, and the FAQ sections don't help my level of noobness.
So, what is a good country to start with to get a feel for this game?