I'm not a Japanese teacher and interpreter either.
I didn't know how to respond to someone asked how to be an interpreter and he is still 17 years old but, I didn't think to answer well.
What should I do. Anyway, I wrote some comments to him.
I recommended one group.It is where he could find the information if he asked the same question as on my group post what he wanted to know.
I also wrote he would need to use Japanese in other group but, I think it is easy for him.
I hope it works for him.