Shakespeare, I lived and worked out there for almost 3 years until 2006. I have also advised a feww people with offers out there, so I hope I can help in some way.
The package seems low. The basic should be closer to 35-40k AED. Also ask about:
(1) EOSB (end of service benefit). A statutory requirement which accrues about 5% of your salary paid when you eventually leave.
(2) Flights home, this is normal.
(3) Relocation out (and back when you leave).
(4) How much annual leave.
(6) Medical - essential if you get mown down on Sheikh Zayed Road!
(7) Notice period...ask for 3m.
Its a great place to live and work. Best years of my life. Great people, relaxed, sunshine, beaches. Highky recommended