How do I bring my vehicle into Norway?

Hi everyone! My partner and I are hoping to move to Norway in a couple of months, to travel around the continent in a van and make a documentary of our adventure. Question is- how much would it cost us to import our secondhand van? I read an article which dates back to 2004 which says that we don't need to do anything in particular if we plan to stay in Norway for less than a year. -Does this mean we can just enter the country via the ferry and drive off, or do we need to register somewhere still, pass some kind of test ? -But after that duration, we need to register the van, which will probably cost us as much as the van itself, right? -As anyone tried going out of the country for a couple of a month with their car, and then back in? Does this work, or not because it's the driver that's registered, and not the car? >> then what if it's a different driver which enters the country with the car? Thank you all for your help in advance!