I hate to break it to you fellows (even the ones who can't even write in real, grow'd-up sentances...), but at the start everyone will be forced to play a Roman faction - meaning Brutii, Scipii or Julii. I'll probably be Julii first, because I know a bit about Caear and crushing Vercingetorix and Pompey appeals to me. Plus the Brutii have to deal with a powerful enemy (the Parthians), and the Scipii have Carthage to tangle with. The Julii have the comparatively tame Gauls, Celts and Germanii to battle, so I think they'll make a nice introductory campaign.