how much money do stage managers make for working

Working capital is required to drive the day to day operations of your agency. In most staffing agencies the operational needs vary during the year (and the working capital tides over the fluctuating expenses involved with doing the base business.
The most important step of starting up a new business is to determine how much capital you can reasonably expect to raise, and what you should do if you cannot raise the amount you think you need. Further questions are: Should you try to raise all of the capital you need at one time or should you do it in stages? And, is it desirable to raise more capital than you require?