First of all your husband should get a work visa to Qatar with a minimum salary of Qr. 10000/- to enable him to bring his family. I think it is quite difficult to get visas for Pakistanis and further more I don't think it is possible to get a Salesman's job at that salary. He should be having his Residence Permit first and should have a salary statement of 6 months to sponsor the family. Hope everything is clear to you now.