I did this about three years ago for OOTP6 or 6.5 but have not looked at it for a while. I will see if I still have it.
As for the "real" MLB financials, good luck! MLB has not released any information since 2000 and even that has been questions throughout the baseball and financial world for its true accuracy. You may be able to guess at good media contracts since MLB just made a new deal with DirecTV. Merchandizing is going to be a crap shoot!
Anyway, not trying to discourage you, just a shot of baseball reality
Go for it and Good Luck!
I'll look for that info I did a while back. Maybe it can help you out.