Devathai you don't need to apply for a work visa  in order to work.

All you need is your husband NOC letter and you can apply to any company of your choice. After that your company will arrange for your work permit at the Ministry of Labor. Some companies preferred husband or father's sponsor applicants. Another advantage is you can change employment without much hassle. Being your husband as your sponsor you should not stay more than six months outside Qatar. You can stay more than 6 months provided your husband has extended your outside stay of Qatar by reporting to the Immigration Doha airport before the 6 months period and pay extension fee in order for your residence visa not to be cancelled.