You can either do it for free on Trulia and Craigslist and other various sites or hire a property management firm or a Realtor themselves (who can advertise the property through the MLS). Fees are fairly competitve and usually range from a half month to a full months rent. Property management fees for companies to manage the property after the tenants are in can range from 6-10% a month. These are ball park figures, but should help you to decide if you want to do this on your own or consult with a professional. If you decide to manage the property yourself, please be advised of all of the laws, especially pertaining to eviction. There are a lot of professional tenants out there that know more than you do, so be careful! Feel free to call if you need any assistance or guidance.