Urgent: Kindly advise: is this Job offer acceptable and enough?

Dear All,

I'm writing to kindly request an advice on an offer I just got from a company based in Dubai (freezone).
The position is a Business Development Manager within the GCC territory (engineering consulting company).

Total Salary Package per month 35,000.00 AED
           Basic Salary: 21,000.00 AED
           Housing Allowances: 12,000.00 AED
           Transportation Allowances: 2,000.00 AED
           Medical insurance is provided by the company.
           Vacation of 30 calendar days paid annual leave.
           Discretionary bonus upon performance

Is this a good number or just normal number given the 10+y experiences in France, Germany, USA and recently KSA (the last 3 years) (PhD + MSc holder)

I'll be with my wife and son (2years old). Is this enough and how much saving will be possible in Dubai for a normal way of living?

The bonus is ""Discretionary bonus upon performance""? Is this normal or should I change the word and remove discretionary?

The contract is one year extendable with 6 months probation period. Is 6 months normal duration for probation period or should I request to review it?

I'm actually surprised as they did not offer a flight ticket and argued that this is already included.

The company is based in free zone. Is this has any consequence on the contract that will be signed?

I HIGHLY appreciate your help and replies.

Many thanks in advance.