visit Qchp website.. visit guidelines for physicians.
http://www.qchp.org.qa/en/Pages/Home.aspx

http://www.qchp.org.qa/en/Pages/HowToRegisterToPracticeInQatar.aspx

check your eligibility for working.
Apply Dataflow
Give Qatar Prometric Exam
Find a job
Apply for evaluation at QCHP
Get your visa
Come over and apply for qatar ID
apply for medical licence