PS1 Patching Help

[Millwright]

I purchased a used ps1 for my son and I want to copy games for him. I have beendoing some reading and I am using the cdrwin burn program as suggested and have saved the game to my hard drive. So how to I know what file I should use to "patch" the game so it will work on his system? Do I need this chip that I have read about? The game I am trying to patch is Harry Potter 's philosopher's stone. Be patient with this post I am new at this thanks