At first, what is your profession? then is basic salary reach to their requirement - 7500.oo qatar riyals, all document must be attestation from your country from marraige certificate to birth certificate, then send it to your Embassy here in Qatar for stamp and after that Ministry of Foreign Affair (MOFA) in old al ganem, Doha.
After that send to Labour Department in C ring road, after receiving in MOI net, if it is approved, then go to the nearest Ministry of immigration in Gharafa... after that... you can bring your family...
did you pass.. the criteria? or requirement if not. dont apply anymore...