1. Don't go back to school if you want to start your own business - volunteer and assist with a similar business. Look for a mentor.
2. Don't go into Finance
3. Continuing education is fantastic - but you'll get more out of an MBA program when you have some life experience to apply your studies to. I have an undergrad in Finance, and an MBA (without specializaton) - now that I've spent a couple years in my job performing PR functions, I am interested in going back for my second MBA in communications and public relations - but it's because I've found something I am truly interested in; it's not about making money.
4. PS - don't make life decisions such as going back to school by asking people on EF. Figure out what you WANT to do - not something because you think you HAVE to. Maybe alk to a career and education counselor?