Would it be a good idea to get a mentor to help me in my plans?

Yes, your main focus should be on the core business. Everything else to do with tax, licensing and so on you can get help with. It is a good idea anyway to get yourself a trusted accountant who will know many of the answers to the questions in this FAQ.

More information
There are own organizations that can help start up businesses. E.g. https://oppstart.no/

Furthermore, there are several banks that also offer this kind of help e.g. Sparebank 1 SMN, Danske Bank  or DNB.