what will i need to submit for hong kong visa?

hi, i am not sure if chinese and hong kong are the same. I already have a round trip ticket for hong kong. the only thing is i don't have anyone to invite me. i have not booked for the hotel. so my question is if the air ticket is enough proof to get it since i won't be able to book for the hotel until 11th (i fly on the 12th). also is 4 day normal processing time for HK application?

p.s i am a myanmar citizen living in thailand with valid education visa.