How do I go about finding a realtor that has knowledge and experience with selling raw land?

The first designation you want to look for with a land realtor is the ALC (Accredited Land Consultant) Designation. This designation proves they have the knowledge and experience to help you sell your parcel of raw land.  Here is a link to the REALTORS(R) Land Institute (RLI), and a search tool to find ALC credentialed professionals in your area: http://rliland.com/SearchForm.aspx