Ok.... First, terminology can be confusing for anyone. but lets asume that this is what you say.
Fist, the XTi is fine to start with, and ide put the money into glass, not body, unless your going super serious.
Second, because of my own personal experiance, I would put more mony away and dig for either a 5d, 1Ds mk 1 or 2, or a 5D mk2. (LATER ON!!)
In the meean time invest in books, and knowledge. Dont hesitate to ask us. Well explaine it as you go along.
then, more importantly, if your in this time frame, you will definatly need a huge amount of practice. then go practice, and practice after that. Then you can start practicing, and then finally practice. Your year time frame is very short, you will need to eat sleep and live photography to get to a simi pro level in that short period of time. but if you are commited young padowan.. you will eventuall become Jedi.