Basic editing for non programmers

Hi, I can’t program at all but have had a little success making small edits to previous versions for forge. I’v got some questions that will hopfully also help other people like me
1: if I want to add cards to sets E.G. adding GhostFire into RoE is it as simple as adding that code with an appropriate rairity under its existing one?
2: Its fairly easy to make simple changes to cards E.G. giving a creature a type you think think fits the art better. But what then? There seams to be something undoing my changed when I just replace the file in the appropriate lettered folder, is there something different I nead to do or is it even more embarisngly I that I just don’t get how ZIPing works?
3: Any idea yet how to make a cube that used rareity?
Thanks for any help with my small issues as I know your struggling with bigger problems.
1: if I want to add cards to sets E.G. adding GhostFire into RoE is it as simple as adding that code with an appropriate rairity under its existing one?
2: Its fairly easy to make simple changes to cards E.G. giving a creature a type you think think fits the art better. But what then? There seams to be something undoing my changed when I just replace the file in the appropriate lettered folder, is there something different I nead to do or is it even more embarisngly I that I just don’t get how ZIPing works?
3: Any idea yet how to make a cube that used rareity?
Thanks for any help with my small issues as I know your struggling with bigger problems.