The person who wants to start the business is the "would-be businessman." The phrase "would-be" is used to mean that this person would be [that thing] if the circumstances allowed it.
So if I wanted to start a business and I used my own savings account, the money is coming from this would-be businesswoman's personal savings.
Capital is another word for "money that is avialable to spend." This article says that if the business owner uses his own money, it's called "equality" capital - I would ask that you look that part up again. It should be "equity."
Does that explain it?