My Friend! Go with NOC letter for Visit visa for your family from your sponsor/Company,filled Application Visa form in Arabic from typing centre,Your family passport copy,your passport copy and your Qatar ID card copy and your marriage certificate attested(should be in English or translated in English).Go to one of the immigration Office normally Medina Khalifa Office on North Road/Shamal Road.Get token from reception and when they call you on your turn,go and submit application.Within Three days you will get the Visa after your application is successfully submitted and you get receipt for this..Normally on the Day 2 your Visa is ready.Go and pay money and get Visa from immigration office.