Your life experience and sincere desire to help the students is usually enough by way of teaching material.

In all probability, you will be teaching Oral English. If not, there will be a prescribed text. Many Foreign Teachers tend to look down upon the students here, primarily because of their (students') lack of English and limited exposure. If you can look beyond their apparent limitations into their hearts and minds as individuals, I think, you will succeed admirably as a teacher.

Having said that, if you find any material that is reasonably simple and has potentail to move them, you can bring some such material with you. It might prove useful.

Best wishes!

Jack

PS: Thanks!