1) There is no standard amount--you can work this out any way you want.2) You can absolutely give him a  "commission" based on the accounts he handles without giving him ownership (or based on new business he brings in); or you can pay him a set amount per property he works on; or you can pay him either a yearly salary (broken out, as all salaries, into weekly installments) or an hourly wage, based on hours worked. He can be an employee or, if he sets up his own LLC and the LLC handles projects for you, with the LLC, not him, having  the contract with you and invoicing you, be paid as a contractor. You really can set this up anyway you want. You  may wish to speak with a tax-preparer or accountant about whether there is any tax advantage to you to doing it one way or another.