Firstly the language is Arabic.

Good, highly qualified doctors can earn good salaries in the UAE, so your fiance will be fine. You shoudl be able to get a job, but it really depends on what you are after. He will not need to speak Arabic.

I am sure there are various medical journals & websites that will have info regarding positions for him (& also info on this site regarding recruitment agencies), but note that as you are not married, if you don't obtain a job you will not be able to get residency, as he can only sponsor a wife.