I would encourage you to check out the free resources available on www.DNAadoption.org. There is also a Google Group that provides support and advice. As Matthew said, you have a pretty strong match on GEDmatch. You might want to search "contact" on DNAadoption.org for advice on how to make first contact. Without lying, avoid using the word "adopted" in the initial contact as it can scare people off.
Pam Tabor