Halfdan M Paulsen (1902-1980) RELATIVES

We are looking for Halfdan Paulsen`s relatives. We know that he lived in the state of Illinois and died there in 1980. His wife`s name was/is Esther. He was born in Norway 03/23 1902 Bergen (breivik) We have just started looking and we are wondering if anyone can help us with were we can get useful information. He was still in Norway in 1927. Please help us