I do not know as of now any company that helps in getting the paper work done for th setting up of a home-based business. But I believe there are a few and possibly you may get to hear from them.
I do not recall seeing any shops that sell Pakistani ladies clothes in retail in Doha. There was possibly one in Musheirab area but it closed down after some months of opening. Possibly, one of the reasons for its closure was non-availability of parking space near the outlet. The only place I know for sure where Pakistani girls work in Doha, are at the several Pakistani schools. Other than that, I have no knowledge but hopefully there may be.