Hopefully someone who has worked on Murder Drones models know what this is and what its purpose is makes a comment on here. ^^;

Next you open up Unity. Simple. Go ahead and make your folders if you want to if you're organized. (Mats, Texts, Animations, Playable Layers, etc) You don't HAVE to, but its useful.

If you never done this before by hand let me explain the folders.
When you drag and drop your model into Unity, you will open it with the tiny arrow next to it and see these strange white orbs. Those are Mats, aka Materials that your model uses.
Usually you would have your texts uploaded in Unity first BEFORE the fbx and mats, but sometimes they don't attach themselves.
Texts, aka textures are the PNGs, JPGs, PSDs you have or someone else used for the model. You just grab the textures/images into Unity and BOOM, you got your textures in Unity.

The animations are typically done by you and you alone, unless someone else did them, then they should be in the model's FBX or 'prefab' in this case.

The playable layers are just your menus and paras. (Paras = Parameters), these are the keys to making your animations work. Menu accesses then, Paras make them happen. You have Int, Bool, Float, etc. Each one with their own gimmick. Most people like myself use Int and Bool.

Int gives you the ability to go from the default state, lets use expressions as an example--to a different state such as... angry lets say. If you go from Angry to another state, it will stop the previous state and switch to that one, assuming you set the paras up right and set the FX layer right.

Before we get into that though, you want to find your model in the bottom middle menu where dragged and dropped it into or from the scene. Click on it, go to the right hand side and click on 'select' or whatever it says. Its a tiny button close to the top right-ish. Make the model 'Humanoid' and configure it. After that's done, go into 'configure' and make sure everything is as it should be. If you have visemes, go into the head section and remove the 'jaw' bone and replace it with 'none'

After that, go back to your model's FBX again and open it up by clicking on that arrow next to it. Find all the materials I mentioned and hit CTRL + Left Click on each of them. Then right click and hit 'Extract from Prefab' if it won't let you, deselect one or two and try again and repeat the process till you have them all.

Once done, if they're white, click on them and change their shader to the one you want. Find the little box that says 'Texture' and find the image you want as the texture for the model. Remember, these ARE on the model. So if it looks weird, it might not be the right texture. If your model looks inside out or transparent, it means its faces are facing the wrong way. THAT is a Blender issue and easy to fix.

(If that is the case, In blender go to edit mode, hit A, then Shift + N. That's it.)

I think I have a video for you to help guide you.
I learned by myself mostly, but I think this will help you more than most can.

Link: https://www.youtube.com/watch?v=vWr4diTDqJM