Researching the Stewarts of NC TN as Well as the Fitzwaters Seamans and Burkholders of PA and NY

Newbie here--Fortunately I have some published information about several branches of my family, but there's always something juicy left out. My great-grandfather, Wallace SEAMAN (b.1876) and his sisters Mary Emily and Ella supposedly lived with Amish members of their mother's family after her death (The Seamans were Lutherans.) I've only got a birthdate for Emma BURKHOLDER (Wallace's mother-b.1852), and am trying to figure out how to get Amish genealogical information. Looks like I've got quite a journey ahead of me!--treenut