Quickbooks accountant/Payroll

I run my own small law firm with 3 employees and one contractor. They enter their invoices into Quickbooks time and it is synchronized with Quickbooks. The job entails the following:
1) Email 50-100 clients weekly invoices based on the time the employees entered, including client's fees for credit cards if they used credit cards to pay, and other fees incurred for clients;
2) Run 2 times a month payroll for two employees once a month;
3) Calculate employee's sick time, and vacation time based on their hours worked;
4) Weekly bank and credit card reconciliations;
5) Respond to employees and clients if they have questions.