Some of the Friendship Church records are online at www.tngenweb.org/polk
Others would be available at the Polk County Historical Society, Marian Presswood, President and you might also wish to check with the Polk County News as they have many historical and biographical articles for sale at very nominal prices. firstname.lastname@example.org
Your ancestor probably lived in McMinn county since Friendship was in McMinn until Polk was formed in 1839. The Hiwassee River formed some of the northern boundary of Cherokee lands until the Treaty of 1838 after which a strip of land north of the river was taken into Polk Co.