I take it that you're from Norway? I believe the English schools are fairly picky about hiring teachers who come from a country where English is an official/native language. Perhaps someone can chime in regarding the amount of leeway they'll give you.
As for flipping burgers, you won't be able to do that without a work visa and I'm pretty sure that McDonalds, Mos Burger, etc. will not go through the hassles of obtaining one for you.
How's your Japanese?