The Cambridge English team has published this very useful article.
Teaching English is a rewarding profession that can enable you to live and work in fascinating places all over the world. It will give you the opportunity to learn valuable skills, such as problem solving, communication and flexibility. As well as developing your professional skills, you also get to experience different countries and cultures. You may even get a chance to learn a new language too!
If you want to teach English abroad then a great way to start is with initial training and a good qualification. CELTA, for example, will give you the essential knowledge and hands-on teaching experience that you need to start teaching.
There are thousands of English teaching jobs available around the world each year. You should research the opportunities in that country when deciding on where you would like to work. There will be more opportunities in some countries than others, so you may need to be flexible. It may be more competitive in certain countries, so having a qualification and teaching experience will give you a better chance. There are lots of websites that list job opportunities to Teach English as a Foreign Language (TEFL). These include TEFL.com, teflSearch.com, eslbase.com plus many more.