FIND FAMILY IN NORWAY

I AM LOOKING FOR FAMILY OF MY GRANDFATHER WHO WAS BORN IN CROGGIN FEB 20-1884.HE WAS THE SON OF JOHN FERGUSON AND HAD A SISTER NAMED OLGA MY GRANDFATHER NAME WAS IN THE USA JOHN MARTIN FERGUSON AND HE LEFT NORWAY AT A VERY YOUNG TO COME TO AMERICA AS A STOWAY AND NEVER RETURNEDTO NORWAY. CAN YOU PLEASE HELP ME GET SOMETHING TO START WITH