Some schools require teachers to have a Bachelor's degree and TEFL Cert; others require one or the other; for others the fact that you're a native speaker is enough. The governments of some countries even stipulate that a degree is necessary for teaching; so schools have less leeway.
The qualifications necessary to get a job may reflect on the quality of the school and its teaching. You haven't said whether your university puts limits on the type of school you can work in but this is something you need to consider.
You could start by looking at language schools on various sites on the web and post your own CV. If you find qualifications are a problem, you can look at government or Ministry of Education websites. Some state schools and universities take on language assistants. These are not the same as teaching posts but they don't require the same qualifications as a teaching post. Another advantage would be that you'd probably have school holidays at the same time as your son.
The information provided in this forum is intended for guidance only. We can only provide general information as situations vary from country to country. It should also be noted that economic and political situations change. We advise you to contact embassies and consulates before making decisions involving a move to another country. Tefl.net cannot be held responsible for any decisions you make based on the information provided here. It is your responsibility to gather information about employers before accepting a job.