It is a little tough without a specific house in mind. Probably 80o to 900 a month it would be more if it had a pool. Our office charges one months rent and 10% monthly, for rental management. I hope that helps.
Most management companies charge one month's rent for procuring a tenant and 10% of the monthly rent to manage. If you have multiple properties, they'll often work out a discount. Repairs, evictions etc will be separately charged and your responsibility.
If you have any additional questions, feel free to contact me.