Use Zillow.com, type in your city / town and state or zip code, then go thru the filters on top. Under Listing Type, make sure "Sold" is checked and under Price, select Minimum amount and select a high enough number so Zillow doesn't pull up low priced homes. Under "More" scroll down to "Days on Zillow" and select 12 or 24 months. Zillow keeps listings for 3 years. Then search your neighborhood and select Sold listings that are similar to your home as well as those currently for sale. On each "Sold" listing, scroll down to "Price and Tax History" and if you click on that, it will tell you who the listing realtor was for the last transaction. For listings currently for sale, the listing agent's name is on the listing.
It's better to start with realtors who either have sold similar homes to yours or have homes currently for sale. At least they will have some experience with your home.