ancestors

hello my name is Steven Sockness (Soknes)? i've been looking for family in Norway and i'm hitting a brick wall right now.. i believe my great grand father (andrew) and his brother (george) left Norway for America in about 1890 .. We think they were born and raised in Bergen and in America they lived in Austin Minnisota, if any could give me some advise on where i might go from here in my search... thank you sincerely Steven Allan Sockness (soknes) ?