You should certainly finish your induction year before considering going abroad, because that will make it much easier to return to teaching in the UK. Many teachers find a period working abroad worthwhile, and even, in some cases, better paid. Many overseas schools and governments (including the New Zealand government) advertise in the back pages of 'The TES' job sections, so that's a good place to start. You could then do a web search to see how posts are advertised in the area where you are interested in working. Don't forget, too, that the British Council has some exchange opportunities.