PART 2:
Thus, I would personally argue that only after having learned either Norwegian or Danish to quite a high level of fluency, a non-native speaker (of either of the two languages) might be able to benefit from the similarities between the two languages. If, for instance, you came know Norwegian very well, you would be able to read Danish newspapers etc. without much trouble. My guess is, though, that even at an advanced level of Norwegian, you would still struggle in quite a few situations when attempting to communicate with Danish people, and you may even have problems with comprehension when watching Danish television, listening to Danish radio, etc.
Sorry about being sort of pessimistic here... This is only my humble opinion as a native speaker of Norwegian, and my advice is given with the intention of making your language learning process less confusing and frustrating - in order for it to instead become more fun, motivating and rewarding.
Hopefully, you'll soon come across some truly inspiring Norwegian language learning resources as well.
In any case, I wish you the best of luck with your language learning :) Or, as we say in Norwegian: Lykke til!