Don't know if you are getting a permit for the project but
your local building/planning department will probably have
at least minimum requirements for natural lighting in your various rooms
that could provide guidelines.
If you need help with the design I would check with a local
college that has an architecture department. There are many students
in need of projects that would be willing to draw up plans at a
very affordable price.
Best of luck with the project!!
Richard The Door Guy