I'd search for rentals online just like your prospective tenants would be doing. I'd then call the first 3-5 that show up in the search engine & interview those agents & pick the best one based upon professionalism, ease of contact & your personal preference.
As a member of the National Association of Real Estate Property Managers, I recommend you contact the website http://www.narpm.org and select from those realtors who really do specialize in rentals, not just some realtors who do rentals.
I say you list with the broker with 50-60 investors in thier back pocket. That way you always have a plan "b" with a fair offer from an investor. And never go with a realtor that says you shouldn't consider al offers....
Here is a fantastic place to start: http://www.iqrealestate.com. It is a Real Estate Directory. You can see Realtors in any state you choose and communicate with them. Ask them any question you would like an answer to.
The Real Estate professionals listed on the site are also rated. Another great way is to get referrals from friends or relatives who have had successful relationships with their Realtors. I would be happy to refer you to a fantastic Realtor in your area if you choose. Feel free to contact me, 908-334-7174
First thing would be to find out what similar homes are renting for. I would be glad to prepare a CMA (Comparative Market Analysis) on rentals in your neighborhood. Monday or Tuesday I will be in PSL taking pics of a home I will be putting on the market for lease. Send me an e-mail w/ details.
Call them and act as if you are trying to rent a place
Make sure you do a credit check on the renters, and have adequate deposits in place.
Take pics of every room, all four walls and include this as part of the lease agreement