Just choose the car what ever u like. Downpayment not required if u can get Bank loan certificate from your company. the dealer will doit all for u. Isurance, Instimaara, and dealing with the bank for loan.

Why u should get International driving license? in qatar u must get qatar driving license, .. get course a test and international license will not consider then in qatar.

no need converter right to left side for drive, if you're driving in u home country, that will not problem what ever drive side.

goodluck