Depending on what your interest in theater is, I always recommend working on plays. It's a great way to be introduced to the field, and also a great way to be seen by agents and representation. I'm also a great advocate for studying acting at a drama school or a college.
“The important thing for the survival of the Thai society is that the majority of those who work, both in the government and the private sector, still strive to work in the same direction; this is why the Thai nation still stands.”