My journal article, “A Fable: Seven Counselors and ‘the Plan’” is about the role of the counselor. You can read it from my web page. A less fanciful discussion of the role of the school counselor is available on the American School Counselor web page.
I highly recommend Comprehensive Guidance Programs That Work - II, by Norman C. Gysbers, Ph.D. who is considered by many to have created comprehensive school guidance. Dr. Gysbers was kind enough to write to me and comment positively about the Seven Counselors article, so I'd guess that it was on the money.
Good luck with your project.