in all honesty - you will not be able to live on this salary comfortably here. you should consider why you are coming to Qatar. If you're coming because you don't have a job in Egypt, then well... you don't have many choices. If you have a job in Egypt that pays reasonably well, then don't take this offer. Get more experience in Egypt and try looking for a job here then (more experience = more salary :o)
as riaz_ak said - this salary doesn't allow you to bring your wife over, she would have to find a job here and come on a separate work visa. working visas for females in Qatar are hard to get.