Looking for Anders Salveson dob 6-24-1892

We have information that says he was born in Bergen. Immigration papers say that he arrived in England on 11-12-1912. From there he boarded the Oceanic ship and sailed to New York, arriving 11-20-1912. I am looking for information before this. I am looking for parents names, siblings, and relatives. Also, I can find no record of the date he left Norway or on what ship. If anyone has any suggestion for where I may look, I am extremely grateful. Thank you.