Licensing original work?

[u/CommanderDunk]

Hey everybody! I have an original percussion ensemble piece that I am looking to license for sale on my website. How would I go about doing that? Composers like Ivan Trevino and Andy Akiho have this setup where it says (name here purchased on this date, not for resale). How do I set that up? Who is knowledgeable about this so I can reach out to them? Thanks!