What should I do if I am illiterate in English and get off the plane when I go to Manila to work?

You'd better find a customs clearance service for this.

If you are on your own, you must be aware that when you pass through the immigration office at the airport, they may ask you what you are here for. You must not say you are here to work. You are going to travel, so you need to prepare your answers: return tickets and where to stay. If they feel that you are not here for tourism, they may refuse your entry.