a LOT exists, it's hard to figure out what's best for you specifically because one thing might work for someone and it might not for you - try seeing how non-japanese people study japanese as well. it really depends on how well you learn. for example, if you're more of an auditory learner, you can just go to yt and search up "japanese children songs" or something beginner-friendly and start picking up the language from there. you could also try watching japanese shows with subs until you're comfortable with.
