Hi,
Welcome to the forum.
Obviously, alarm bells should be ringing if you get a job offer without any sort of interview.
It is illegal to charge candidates to get jobs in the UAE - so you need to lookout for "advance fee scams". This involves asking you to pay "processing fees" or ticket fees to a travel agency - with the promise of a refund when you arrive in the UAE.
Of course, the crooks take your money - no real job and no refunds.
Most of the hospitals in Dubai have HR departments and advertise jobs on their own websites - so try looking there.
Cheers
Steve