If you are working with young children at a beginner level, there will often be a native speaker in the classroom. If there is not, then there will be a native speaker nearby.
In most Asian countries, foreign teachers are assigned a bilingual secretary. These people will help you with any problems that might arise.
Most schools prefer you not to speak the language of the country, and thus, you will need to learn to communicate with miming, pictures, and expressions.
Visit Oxford Seminars ESL Teaching Resources page for ideas on classroom techniques and games in an ESL classroom.