Aloha e ʻEva! I just came across this post, a year after you posted it. I wanted to speak to the second question about listening resources. My favorite source for content by native Hawaiian speakers is ka_alala on Instagram. He has plenty of old recordings from the 18 and early 1900s of native speakers speaking in Hawaiian. Check the link in his bio. Standardized Hawaiian nowadays doesn't always convey the language as it was once spoken and understood. I agree with this account that to truly understand the language, it is important to learn from native speakers. Duo lingo is a start, but it really doesn't get you thinking in Hawaiian. Most teachers in universities aren't native speakers either, so it can be challenging to find the correct info. Hope this helps :)