[Nyororin]

What skills do you have?

Just like getting a job anywhere else, you need to have some sort of skill to do one. English teaching is the most frequently given example because it is a "skill" that English speakers have that is also in demand in Japan.
Not speaking Japanese puts you at a serious disadvantage, so you would need to have a skill that Japanese people cannot easily provide for most positions.

Anything dealing with customers is going to need you to be at a functional level of Japanese... So if you have no skills your best bet would probably be something like a dish washer or the like.