As a first time author, I do have a couple of questions. Do I need an ISBN for medium content such as puzzle books? Do I need a Copyright registration for medium content like puzzle books?
You don't need an ISBN for Amazon. They give you an ASIN. Otherwise, it will depend on where you're selling. The copyright registration will keep your content safe, but it's not required in order to sell your book as far as I know. But I am not a law professional.
