Become an amazon affiliate in which location

hi, please could i get someones advice on this, I want to sign up as an amazon affiliate

I live in Cambodia, and I have bank accounts here in cambodia, and also in Spain, Australia and New Zealand. I think Amazon have different affiliate programs for different locations, which would i be best to apply for?

And how do they pay out? I could probably recieve a checque, and I have a paypal account, or I could get bank transfer directly