"How could I find more information on who lived in this area?"
-By searching the original vital records. Historical archive of Pančevo has these available on microfilms - the vital records books themselves have been returned to the central authors of all denominations :http://www.arhivpancevo.org.rs/fondmfde.htm
-by searching secondary sources like trade and tax records, school records, military records, local newspaper and land ownership registers.
-by locating and contacting community resources and heritage groups if your ancestors belonged to a specific ethnic group - cultural and ethnic associations, present-day minority council.
Serbian Genealogy Society SGS"Rodoslovlje"http://www.rodoslovlje.com/en