You need Immigration permission to work at a camp:
Outside of your primary workplace. It will either be registered as a secondary workplace (if you currently hold an E1-2) or you may be eligible for a Temporary Employment visa. Inquire at your local immigration office before teaching at a camp to ensure your legality.

Working "Privates" or "Part-Time Jobs" without Immigration permission is illegal:

Working in a second registered business place is possible (a secondary workplace) if you have permission from Immigration. However, working "privates", or tutoring at a non-business, is illegal.

Your visa is associated with ONE location:

If your employer asks you to work at more than one physical school, you need to get Immigration permission and apply for a secondary workplace permit. EPIK and GEPIK are exceptions. EPIK employees can legally work in multiple locations without Immigration permission.

It is illegal to work without a proper visa:
You must have the visa sticker in your passport before you can start work- without exception. If your employer asks you to work before you have your visa sticker, refuse. Insist on getting your visa before you teach your first class or you are working illegally.

Before Accepting a Job in Korea :

This is advice for E2 and E1 Visa holders. Most of the rules/advise listed here does not apply to F1-2, F4, F5, E5, E7 or other visa holders. For further information about your visa limitations, always inquire at your local Immigration Office before starting a new job

Job link for china:
Job Link: http://www.learn4good.com/jobs/login.php?login=jobseeker&from=view&job_id=28888

here is a link you can visit and sign up with your resume.

Learn4Good Jobs

Language school associations: Find out if an association of language schools exists in your chosen country, if they do then ask them some questions.

The contract:
Needless to say, when you get your contract you need to read it carefully. Make sure everything you agreed on is included and check that they haven’t added any sneaky clauses. Don’t be afraid to ask for a translated copy of the contract. This is completely normal and should be expected.

Research: research your school to make sure it is completely reputable.

I hope that thsi info will help you in some way.

Resources:
It’s easy to say that any reputable language school will have a selection of teaching resources (like handouts, card games, lesson plans, dictionaries and grammar books) but this isn’t necessarily the case. These resources take time and money to acquire and if a language school has just started out then it won’t necessarily have them yet. If they don’t have such resources ask them why and question if they have any plans to build up a resources section in the future.

Prepare some questions before the interview and make sure you ask them.
Does the school only hire qualified TEFL, TESOL teachers?
Does the school perform regular teacher assessments to ensure teaching quality?
Does the school follow a set syllabus?
Does the school encourage student feedback?
Does the school have regular tests to assess student progress?
What is their contract like
Have the company send you a email copy look it over
never send them your orignal diploma copies, send photo copies.
Do the companies that are hiring provide?
Work visas: If they won’t support your application for a work visa then you need to find another school that will.

Qualifications:You should be wary of any school that doesn’t ask for some kind of formal qualification. Some schools ask for degrees, other just require a TEFL, TESOL qualification, but they should require some proof that you are able to perform your duties as a TEFL teacher.