info on Jorgen Olson please

hi all, i am looking for any information on my great grandfather, his name is Jorgen olson/olsen, his parents names were Ole Paulson Kalstadkileu and Johanne Margretlie Petterdatter, he was born 16.5.1843 at Sannidal his siblings names are Paul, Johan Peter, there are 2 sons with this same name, 1 was born 9.1.1824 the other 12.10.1826, maybe the first one didn't survive, Hans Marcus, Dorthea Catherine, Johann Olaus, and twins Ingeborg Marie and Iver Paulson, my Grandfather was the Youngest of these children, he left home at the age of 11 years he went to sea as a cabin boy, he arrived on Australian shores in 1862, he continued to sail up and down the eastern coast of New South Wales until he married my Grandmother in 1882, have no names of any ships he was on but I do have what looks like permission to leave Norway in 1854 which fits in with him going to sea at the age of 11, this document has a stamp on it which reads, Sannidal Sogneprestemsede, hopeing someone can help, Jennyarrow