This is an old posting but anyone picking it up here because of its title might be interested in an answer:
I lived in Germany for 18 years. 51% of the post WWII generations speak almost fluent English as the standard of English tuition in the German schools is very high, and the country was occupied by hundreds of thousands of English and American military personnel and their families for around 50 years. English belongs to the same family as the languages of Scandinavia and the northwestern European countries, making English relatively easy for them to learn; the pronunciation is very similar, and compared to their own language, Germans find English grammar so ludicrously easy that they learn the complexities of English idiomatic expressions in next to no time. It is therefore quite possible for a native English speaker to live in the country for years without needing to know a word of German.
The downside is, that because of this, there is hardly any demand at all for native speaker English teachers. Further east however, since the collapse of communism the need for Englis has increased dramatically with the demand increasing yet again since the recent membership of some of the formers communist countries.
While manual workers from Poland are invading Western Europe, TEFLers are flocking to the new language institutes in the capitals of the eastern European states.
Working abroad, particularly in developing countries can also be very rewarding and if you are considering going all the way to New Zealand you may like to stop off in southeast Asia on the way. TESOL certificates are not strictly necessary but a degree in any discipline is an absolute must. Ask for more information on this Teaching in Thailand forum
and if you come across any irregular practices or TESOL course scams
be sure to help others by reporting it on as many forums as you can.