Ole Nilsen and Christine Jacobsdr

How do i go about finding information about my gggg Grandparents. Ole Nilsen was born in Norway in about 1759, (i don't think his year of birth is correct but this is the year given in our family history book), he married Christine Jacobsdr on 13 March 1824, in Trogstad Norway, and we think he died in 1845. Christine was born in 1792 in possibly Langseter, Norway. Are there any census' before 1824 (i would like to find Ole's parents, and where he came from). Also i can't find any records to confirm that he died in 1845, or when Christine died. What years did they do a census in Norway, could someone please give me the web address to find these census'. I hope someone will be able to help me Thanks Sarah