Never use friends or relatives as real estate agents, unless you are completely comfortable with their professional performance. Your house is too big of a purchase to simply use a friend or family member that you have little or no confidence in.
Look on the internet, through the sales flyers and on the multiple listing services for agents that are listing a lot of homes. If they are a buyers agent look for those that have a high earned income per year, this will help you determine which agents are working on closing sales and making purchases in your area.