Hi,
as far as if people will be intrested don't worry qatar is full of expats and if you are good at what you do pple will come to you .

BUT first if you really think about coming make sure to attest and notarize all your documents, get all letters of goodoutstanding too. stamps is somthing they like here! and make sure to attest them by Qatar embassy in AUS.
and don't forget you will be having a residency so do you have a sponsor ready (company, medical center,..)
your family will be under your own sponsorship or with the company too. if you are single then less procedures

as far as legality contact the Health ministry in Qatar, licensing Dept. they can be headache sometimes so make sure you get the EXACT right information and requirements from them +974 4473111
good luck