just go to the airport immigration ,near to the airport with filled application form which is available on moi website along with copies of wife's passport ,marriage cerificate ,your qatar id and pictures of both of u. you submitt it today and check for the approval in 3 days.if it is approved she can come within 3 months.if it is not approved because of ur profession ,u hav enough time to correct it...........rush immediately..

http://www.moi.gov.qa/site/arabic/departments/Airport/resources/2009/07/...

http://www.moi.gov.qa/site/english/forms/index.html
check any of the link for tourist visa application form