Tax help needed!

Hi everyone,
I'm new to this forum as I'm desperated to understand my tax situation considering NO ONE (including tax specialists) have been able to really help me to get a clear vision of my situation in HK. I just moved here (Im from Chile) and from May 1st my contract starts, my situation is the following:

Base annual salary: HKD $1,534,020
Rental allowance my employee has agreed to spend for my housing: HKD $65.000 (monthly).

With this, I need to understand the following points:
1. Which is the best method for housing payment, and how does it taxates.
2. Considering I'm married, I understand there is a tax benefit for this?
3. I read there is a tex deduction of 75% for some reason at the end of the year which I dont understand why and how it works.
4. MPF, how does it works?

If anyone could help here in how would look a complete tax exercise it would be really really great.

Thanks in advance!