Skot...
Some great advice here, especially Rattler's bit on Quickbooks. My wife was trained as a book-keeper and what she can do with Quickbooks and Excel for our home finances is amazing. I've never seen such a healthy balance sheet for personal finances, my whole life!
Other than watching your books and hiring a good tax accountant, the only other advice I'd pile on is that you should form an LLC. I've found that the tax advantages of forming an LLC are well worth the minimal cost.
