How do I convert/port assets to unity?

[Pingus!]

I want to export assets to unity but I am absolutely new to game design and unity.

I'm pretty sure I can find out how to rip assets but converting them is another matter. I want to convert Digimon World 1 or Digimon Masters Online assets to unity(not just models but terrain, actions, items, abilities, hit detection).

How would I do so?

Hey! Whenever you retrieve the files, you can use this program to decompile them:
https://github.com/RaduMC/UnityStudio

It's supporting most versions of unity, and is the most accurate one I know of. If anyone tells you use disunity, don't. It's awful, and the only model exports it does is Wavefront object. These files are most likely uploaded on a server and must be intercepted through the usage of an HTTPS proxy.