Anything Goes : Copyrights,licensing information by Shilpa Torvi

Hi, I am a Dancer/Choreographer in the Bay Area, and am just getting started :) I am thinking about a project for my students, to work on a western ballet, but I do not know how or where to go to get rights or licenses for this ballet. I have a particular edition of that ballet in mind, but don't know where to begin, or even how much a thing like that would cost. Any ideas? Thanks Shilpa