Whether or not a Lua is script is needed -- and which one, if one's available at all -- is dependent entirely upon what game/ROM, specifically its mapper and mirroring.
You need to provide these details. Don't just say "Bob's Snake Adventure" either, please give actual details (filename, checksum, etc.).
Some (all?) of the Lua scripts have to be modified slightly (not very much though) to work with the game/mapper. If you don't know what to change, you should ask Paul/INL directly; he's very responsive and helpful. You DID buy a product from INL, and the "Support" link is at the top of their website:
http://www.infiniteneslives.com/ . The nesdev forum is not INL support, though we can try to help with some things if you've exhausted official support.