This...as a finance major, the funding aspect gets lost behind the idea.
You have to have an idea, which not everyone has. Then you need personal income/money to live on while getting the business off the ground.
You'll likely need a small biz loan plus some degree of accounting and tax accounting knowledge to actually understand if you have adequate cash flows (how do you account for depreciation of existing assets, what kind of debt payments are you making to get the biz going etc.).
It's a great way to go if you have the resources. Problem is that in order to get the resources, you'll have to work REALLY hard as a worker bee in another job to build up the cash reserves. If you're good enough at that job, you might find yourself in a lucrative career where the cost/benefit analysis makes it pointless to leave.
Most biz owners either come from money, had a crazy innovative idea or were in a situation where they had to work for themselves and couldn't make money any other way.