Well, I'm no expert but I would focus mainly on number 3 and how it relates to your decision to go to law school. You can include a short paragraph of 1 and 2, but keep it brief as to the details of the set up, etc. You just want to let the admissions committee know what it is without going into a whole lot of detail. They are mostly looking as to how your special major relates to law school or how it would help you as a law student or lawyer.