1.Take a leter from your company supporting your salary
2.Copies of your wife passport for proof of the names of in-laws.
3.copies of passport of your in-laws.
4.Your Marriage certificate dully atested by the embassy.
5.Go personally to the Emigration office get a for typed separatel
6.Submit your self,they will ask you few questions answer properly,
7.If you get visiting visa for 1 month you can extend up to six months.
8. If you go to Hotel like Doha Palace or Horizon they will help you visa for 1 month ,but they will have to stay there it will be very expensive instead you can go to visit them.
9.Qatar Airways is only for 14 days and u can extend for another 2 weeks.
10.dont forget your id and your passport copy.