As others have said, you don't. With no money, no connections, no experience, no reputation, and no credibility, you cannot start your own consulting firm and expect positive results.
You should instead go work as an accountant and get some experience, contacts, etc. Also, learn more about business, entrepreneurship, and law during your spare time.
Patience is important. I suggest you wait a few years and first become prepared to start your own firm and then start your own firm.