You might be better off trying to earn money as a "teaching assistant".
there are no teaching assistants in Polish school system.
Advertise yourself as someone who can help people who are already having lessons but are maybe struggling with it.
so what would that be? In Poland it is common to have a tutor on top of having regular lessons at school. Tutor already helps the student.
You could be their conversation partner or help them with written exercises.
that is what tutor does:)
Without a qualification or proper structured learning method you won't get very far as a "teacher" and in fact would just be wasting the time of the students and wasting their money.
not true. I have met so many bad foreign English teachers and they were making good money, because the market was not saturated:).
get a tutoring job/private lessons with lower levels. That would give you the opportunity to practice, become more confident and since you seem to be a sensible person - you will probably not rob the students of their money. LOL.
don't make it too complicated!!