How to use a class in this situation?

Question

C++ / C#

Hello!
I got stuck with such a problem.
I'm currently writing a store and have already written almost all the code, but the problem is that I don't know how to properly use the SkinClass class.
Code
(I know that SetActive could be done in the same class, but it's more convenient.)
It should be a button and a picture.
But how to create them and assign classes that are created in the code to them is the question.
Thanks for any help!