I don't use financials in my games, but generally speaking when I or anyone is looking for something specific to get out of their game and is asking for advice, the best piece is to start off with a test. Don't immerse yourself with uniforms, ballparks, logos & so forth before you have tested out settings to be sure your game is headed where you want it.
IOW, you wouldn't want to spend hours on setup that is unrelated to your the finance aspects of your game, only to move forward a year or two and find out that the financial aspects are nowhere near what you want them to be...
