Nope, you're not missing it, there's no tutorial or main campaing since The Guild 2, Reinaissance doesn't have any of this. My recommendation, look into youtube for tutoriales, and, after you got the basic, play, play, play.
Had my first game as Rogue some days ago, got murdered by guards while being an outlaw.
Yesterday, I got 90,000 coins of gold after kidnaping a member of a rich dinasty, while I was at the Town Hall being proclamated bishop by the grace of God and my wife was healing my whole gang at the hospital she owns after they got hurted while killing the last bishop that was on the way to the town hall.
From now on I suppose my character will spread supreme justice with the god 's hammer, or at least, some kind of justice.
Man, this game is just too epic.
I guess I should just get Vanilla Guild 2. I heard that one has a tutorial and I'm guessing it will get me going more than I've managed to get just clicking around.