salary should be more than 2500/-Qr and the Docs will be

Copy of ur Contract with the co.

Attested marriage Certificate( Attested in the respective Embassy of ur country in Qatar)

Wife's Passport copy, first and last page of the Passport.

and the form which has to be filled in Arabic( if i am not wrong).

All this is required and ur Residence ID should not show ur Profession as LAbour / Helper / Carpenter.