Usually people take baby steps.
Getting a business license as a solo practitioner costs $40 in my state.
If you need to hire your first employee, your state likely has some simple instructions on how to do so. And if you can hire an employee, you can also pay for an accountant to help you with payroll, file taxes, etc.
This is how, like, 90% of small businesses in America get started. Your average restaurant owner never went to business school. If you are not incorporated, business finances are pretty understandable.
If you really want to go big to start out, you can look at a service like Stripe Atlas that should walk you through incorporation.
I'm not saying business school is a waste of time. But if you are motivated and already know what you want to do, you can learn all the same things faster and cheaper by just getting started.