French, if you're really good at it, will help you a lot with Lebanese. If you know Spanish, it will help will Moroccan. I'm not sure what resources are available in Norwegian, but I bet there's not a lot. Some background: I studied Arabic for three years in college, and I've forgotten more than I remember. There is a severe lack of English resources on Arabic, but that's been improving since 2001. GLOSS by the Defense Language Institute has some fantastic idiomatic lessons that I'd recommend: https://gloss.dliflc.edu/ ~ most of them are based on real texts. The best texts and dictionaries available are in French because of historical factors. The first thing that you should know about Arabic is that the 'standard' (fus-ha) is kind of like a lingua-franca between nationalities. Each country and region has its own quirkiness. Here's an example: زوجة - zow-dja : wife Because of the large geographic area that Arabic is spoken in, and the enormous history that surrounds it, the above word could also be said as: جوزة - djow-za : wife It's a lot like "ask" vs. "aks" in English. The problem with consonant-switching (I know there's a linguistic term for it but I don't remember it off the top of my head) is that three three consonant patterns (in general) make up the base-unit for all morphology Let's take the classical example of 'to study' : درس مدرسة : a place for studying (i.e. a school)
درَس : to teach You can see the consistent elements in there, the D-R-S. If you 'double' the R, it becomes more intensified or reversed, from 'to study' to 'to teach'. That is one way of about twelve to extrapolate a verb from its base unit. Maybe you could see why the consonant-switching makes spoken Arabic really difficult for beginners. I'd recommend A New Arabic Grammar by Heywood - my Anglophone college professor would go through it every year as it's an excellent academic overview. http://www.amazon.com/New-Arabic-Grammar-Written-Language/dp/085331585X/ref=sr_1_1?s=books&ie=UTF8&qid=1436059900&sr=1-1&keywords=anewarabic+grammar&pebp=1436059905729&perid=10WJ910B3MX9YC1VK4EM
You could get some short-term, very rapid progress by only learning how to speak it. But very soon, you'll run into a word that you don't know and you'll need to look it up. Or you'll come across a zebra that you need to read. Take the literate approach and learn to read and write it as well, it will help you later on. 