Highschool Student seeking advice

Hello everyone, I am a school student that is seeking to complete my university degree in Japan.

I will finish high school in 2 years, and i am high school student. I am in a north african country but i am i attend a school in North America (Online). I am attracted to Japan because of the Education system, safety, and Healthcare. But, i am confused on a few things.

So, since i did not clear answers to these online, i wanted to ask people here for advice – what are some affordable universities in Osaka or Tokyo that offer good courses in Ecology, Marine Biology, or related topics? What is the best way to get to Japan (considering godwilling my GPA and SAT scores (if needed) are quite well)? Are there realistic opportunities for someone like me in Japan?

Coincidentally have been learning Japanese as a hobby for a while, so i think that will help. What 's the best course of action to take? I might also settle in japan totally if i find that good opportunities are present, is there a specific visa for that (as opposed to studying > leaving the country? I think some countries separate them, i might be totally wrong)

Thank you very much in advance and god bless.