The overseas jobs are most likely to be out East, but they're largely for experienced pilots. Both the Middle and Far East have a demand, but not for low houred, recently qualified pilots.
As far as the US goes, pretty sure you would to have to marry a US citizen or get a company to sponsor you (no one does this for pilots) a Green card. Then also think about how your training would have to be FAA rather than JAA/EASA, which would seem difficult if you want to carry on teaching in the UK whilst training.