create default and customizable inputs

Hey, fam!

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I'm building a really simple RPG-type game, and currently have it set up to use the arrow keys for movement, space for attack, V for special attack and P for pause. I want these to remain as the default controls, but I also want to make an option to customize the controls, especially with a controller that connects via USB (like with the ZSNES emulator, for example).

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The objective is simple enough, it seems, but I also found out that everything I've been doing so far for input is using the "old" Input Manager, and that the "new" Input System Package is supposed to be way better. I'm getting twisted around searching for tutorials, wondering if someone could point me in the right direction to get my head around these two input systems and reach my objective.

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Thanks a million!