Association of American International Colleges and Universities provides information on American universities abroad from which you can get an undergraduate degree. To get a job in an international school you will need to be certified to teach in one of the 50 states.
Some schools require teaching experience.
Most pay well and offer an attractive package of benefits. The students are fluent in English and include the children of diplomats and executives of international businesses. Expect bright students and few problems with discipline. Most international schools do not require knowledge of a language other than English.