Best thing to do is, research, research, research! Look in your local print advertisements (newspapers, real estate publications) & online websites (trulia.com, realtor.com, zillow.com). Active Agents will have quite a few listings, check out how their listings are portrayed (#of photos, description, tours etc). This is the best way to narrow it down. Once you get it down to 3 of the "best" agents, call them & conduct a phone interview. Ask how many active listings they have in your area, how many have they sold in your area this year, what they will do for advertising beyond what you had last time, etc.