You have to find a way you can solve a problem or fill a void that is not currently being done in the market. If you do that you will be very successful.
This is a pretty broad question. What kind of business is it? What are the start up costs? Did you take out loans to started. While you be paid for your services, you need to subtract the business expenses each month (loans, rent, utilities, insurance, employee salaries, etc.,) before you can see what your income might be. It will also depend on the type of business and the demand for the services you provide. It is not uncommon for individuals to start a business, but it may be a few months before they actually see income after expenses. I would recommend researching the type of business you want to potentially start and then reach out to individuals in that arena and obtain their feedback on what their experience was.