For information about Qatar laws/visas,exit visas/investing ...and anything else you can think of check this link out.
Qatar Government website:
Topics - Hukoomi - Qatar E-government
Map with ability to find shops etc on it:
Map
I may have missed this whilst trawling through a hundred something pages but can wives work in Qatar on whatever visa you get?
I cant bring myself to answer this question when the link to all you ask was posted right above you.