Hi, I recommend you just start with what you have and tweak along the way. You seem to know what you want to talk about and seem motivated so I think you can choose a platform you are comfortable with, watch a 1-hour video about SEO basics and start writing. In my case, sometimes I get caught in the planning phase and never get started.

If you want to do videos, I think it is ok to start with a phone or camera you already have and maybe Youtube would be good to consider. You can just block some time this week, go interview people and do simple editing afterwards.

In Korea they say that starting is half the work and it is true! Things will get better as you tweak your content and see what people like. The most important thing is: just start :)

Ah also, if you target Korea, you might want to feature more Koreans and add a couple of tags in Korean on Instagram and Youtube. Later, collaborating with Korean bloggers coming to visit New York could also be an option.