How do I become a WWE star from another country?

Train yourself in your country. Superstars don't need to be of any particular country. After your training, try wrestling in your country's promotions. If you're good enough to attract WWE's attention, you would be selected in NXT or other training circuits for new recruits. If you haven't been recognized, then move to USA and try wrestling in promotions there. You need to be very passionate if you really want to be a WWE superstar, because it isn't easy. It would take years of wrestling before you can step into WWE. It took 14 years for Kevin Owens to step into WWE and 18 for Samoa Joe. But, there are wrestlers who have been selected at a very young age.