Theres more than enough learning-material in Nynorsk. Learning Bokmål first. makes it harder to learn dialects and Nynorsk after. People from the Oslo-area always complains about how "hard" and "unnecessary" Nynorsk is, but this is just because they live in this part of the country and think that the rest of the country is just like it. I began learning Nynorsk in 1th grade, and throughout the years, bokmål just comes by it self through texts and television. Which to learn is up to your self, and depends on where you want to live.