looking for info on Anders Stenersen

Hi, I'm looking for any Info on my 4th greatgrandfather Anders Stenersen born around 1825 in Sande Norway His wife was Susanne Eriksen which was born around 1834 in Norway. They had a son named Martinius Andersen which is my 3rd grandfather . I was wondering what were some of the events that happened in those years and how can I go about finding their parents. Martinius came to America on the Oslo Jan 21 ,1886. Also is there a picture of the Oslo ? Any help would be great. Thank You so much, Talony [;)]