The Arcane Composer

Hi all, I’m posting here because someone online elsewhere suggested that this might be the right place to ask. Apologies if this is in the wrong subform. I’m currently nearly finished a VST orchestration/realisation/extension of the opera from Final Fantasy 6. I was partially inspired by Kelli Butler, Joshua Blue, and Patrick McNally’s charity performance from a couple of years ago—I wanted to make an orchestral version that people could sing over if they wanted (as well as a version with some of my own singer friends singing the parts). It was a pretty large-scale undertaking, and I’d love to sell the result on Bandcamp, but I have absolutely no idea how to go about acquiring licensing or permission to sell. Since it’s about 15 minutes long, I was thinking of selling the separate sections as separate tracks, but I don’t know if there’s any guidelines around that. I think that most releases of the music, apart from the original soundtrack version, have been as a single track. Does anyone here have any experience dealing with this kind of thing, or know where I could look? Thanks.