My unknown Bear Heritage

I just started searching for my family's heritage seeing I know nothing about my father's side off the family.The farthest I have back is a Pinkney Bear who married a Martha Kirby in Champaign Co., IL on July 24, 1871. They had five children (A)William Thomas Bear(B) Rosie Bear Baumgart(C)Frank mar. Edith and had son named Clinton (D)Isaac had kids (Ned?) and twins Juanita and Viola. (E) Marion.Grandma Kirby was on a wagon from Dutch colonies she had gangrene in her leg and was amputated. Pinkney Bear is my great great-grandfather. If you have any information what so ever please help me I desperately want to know where my family came from.