If you can’t figure out how to repath and build the materials I would suggest you start with some basic tutorials on UE4 and materials first, and get a general knowledge on how to use the engine. I doubt you are going to find anyone to actually tell you how to rip out ARK assets though, even if you only intend personal use. Wildcard probably isn’t going to condone such actions. You could buy some items off the marketplace though.
Incidently, Wildcard has used some third party content that does not allow for a license transfer, ie. you ripping the content would be technically illegal.
For example “Ultimate Rocks” is third party content, which you can actually purchase here:
But just because you own ARK, which has a license to use Ultimate Rocks, doesn’t mean you may therefore use Ultimate Rocks for anything- personal or otherwise.*
*Except within the context of being content for ARK of course, like making maps. By extension you can (probably?) modify such content, such as textures, as long as it’s within ARK, and as long a you are not monetizing it.
Though the monetization aspect starts to get really murky but that’s a whole different question.