Hunting for the cheap flights

I am currently planning on my first trip outside S.E Asia... its a big deal for me... since i am not that familiar with all complicated things that follow with the travel requirements e.g visa, hotel bookings and transportation also WEATHER... why weather in caps...? its just because i never been in to 4 seasons countries and Hongkong-Macau teach me a lot to prepare better than before!But i wont