how to work with 3d model you downloaded of interent to get it to work

 This is what we did with the carousel I downloaded

 

import your model as fbx obl or blender file
hit your little circle up in right corner to get the right shading.
hit your materials icon that looks like a globe at the bottom right. then you will be able to see all materials that came with your model. the nodes should apear at bottom. all we did was detach line from base color from the node that was above then we were able to click on base color and change color to what we wanted.
turn one color yellow to get gold. turn rougness down and metalic up

Gabe was telling me to hit the shading tab alot. You also have to remember to switch between object mode

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 Here is how I got the colors to show up on the kissing booth

 Make sure your object is selected. the nodes won't show up if its not.

 Import your model , hit shading tab, then go to add, texture, image texture. Node will then pop up. Hit open and select your image file.  then connect color to base color. then the colors showed up on the kissing booth

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For that really big carousel we had to scale down..... I had to go back to cgtrader where I got it from and download the .mtl file.... mtl stands for material. then I just copied and pasted the mtl file into the folder of the download that has the obj. then the when in blender I just went to import obj and it worked, it had color on it.

now to see what color/material goes with what..... we selected one of the materials, it was called wire_3454334 and we hit the base color and started changeing it and in the viewport that allowed us to see which item it went to. Gabe tried this and the colors were changing. make sure you have the second to last shading circle selected. those are the four circle above your orbiting tool