A great resource for finding information on starting your own childcare business, including a sample budget or cash flow, would be on childcareaware.org. They have samples of cash flow charts, which include cash coming in and going out, for easy tracking of expenses.
On childcareaware.org, they provide many resources for budgeting a new childcare business or even an existing one. The website is an invaluable resource, even including information on how to obtain grants for that type of business. The section on Developing a Financial Management Plan would be a great place to start and provides resources for developing a start-up budget, an operating budget and tracking monthly expenses.