All three. I'm guessing you're a PI national. I think it's still an eighty question written test that covers regs, weather, performance, airspace and other stuff. You'll need to pass a TSA background check before you start flight training, complete a course of flight training and have an Instructor certify you are ready for the checkride. There will be an oral with the checkride that covers areas you missed on the written.
The "pursue flying there," if you mean flying for a career, is totally dependent on your right to work here.