As a sole proprietor, management of a team will not be an issue. I expect to do this myself. The additional personnel cost of $500 per month is for administrative and support help, part time, and only when the business gets going.
Payroll is calculated for myself, and amounts are based expected profits for each month. There is also a second person for support, administrative help, etc. Profits after payroll will be put back into the business for advertising, travel, and other miscellaneous expenses.