Norwegian, written and spoken correctly, is a dying language. Just talk with anyone here younger than 25 and you`ll quickly see waht I mean. About every 3 or 4 words spoken are in English, or better yet, English with a Noggie ending (-en/-a) to it. Grammar is just the same really. What was once common knowledge is now getting close to non-existant. The only ones who speak the language correclty are 2nd generation kids from the Middle-East, whose parents came as refugees during the 80s and 90s. Go figure.
Oh yeah, the advice from the other guys here should help you just fine. Get the basics, then try to communicate. Learning by doing.
We`ll wait with lesson number 2.... dialects