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Maya Texture Setup for Unity
Follow these steps if your Maya Texture files are not located in your Unity Assets folder.
1) Quit Maya
2) Put copies of all your texture maps in the Unity Assets folder where your Maya file is located. Texture files and Maya file should all be at the same folder level.
3) Temporarily rename the folder where the textures came from so Maya does not look there.
4) Open the Maya file that is in the Assets folder. Maya will find the textures if they are in the same folder as the scene file.
5) In Maya Hypershade  , select Edit->Delete Unused Nodes
6) Change any Arnold Shaders or StandardSurface shaders to Lambert, you can do this in the Maya Hypershade or the Maya Attribute Editor, or make new Lambert shaders. Phong and Blinn work, but Unity will ignore the specular attributes. Maya color, incandescence, transparency and bump textures can be opened in Unity.
7) Save Maya file in your Unity Assets folder, or if you made a Materials folder save it there with all your texture maps.
8) Start Unity, the textures, color, incandecence, transparency and bump will be linked to the Maya materials and visible in Unity.
9) Change the name of the folder you temporarily renamed.
In Unity
Add some primitives
Add GameObject->3D Object->Cube etc.
Add some materials
Select Assets->Create->Material.
Double click the material in Assets below.
Drag and drop a material onto a primitive
Albedo Color Maps
Make some 256x256 pixel tiff files in Photoshop and save the files into your Assets folder.
Select Material you would like to map.
Drag the map from Assets onto the Albedo square in the Inspector.
Transparency Maps
In Photoshop
Make a 32x32 pixel dot map with an Alpha channel in Photoshop.
Use the Elliptical Marquee tool to select a circle 
Use Select->Save Selection... The defaults are good
Select the Window->Channels window
Select the Alpha1 channel
Paint the transparent sections black, opaque white, and translucent gray.
Save the file into your Unity Assets folder as a tiff.
In Unity
Select a Material you would like to map in Assets.
Drag the transparency map from Assets onto the Albedo square in the Inspector.
Change Rendering Mode to Cutout
Change Tiling to a higher number for repeated texture.
Notice your object is single sided, you will need to model the inside and outside in Maya.
Extrude is great for this.
How to create a Normal Map (bump)
In Photoshop
Open an image file.
Select Filter->3D->Generate Normal Map...
Save the file as a new name into your Unity Assets folder.
In Unity
Select Material you would like to map in Assets.
Drag your normal map from you Assets onto the Normal Map in the Inspector
Click the Fix Now button
Adjust the bumpiness of the map to the right.
Import a new Skybox
Choose the Asset Store tab next to the Scene window (or Window Asset Store)
Type skybox in the search bar, Select Free Assets
select Download and Import
Put the main view window back to Scene
Choose Window->Rendering->Lighting Settings
Click the  to change the Skybox Material to the skybox you imported.
You can also make your own.
AllSkyFree Skybox BUG
Work around for AllSkyFree skybox BUG, webGL will not publish
These will not publish because of a script error
Select the AllSkyFree folder from the Project tab
Select the arrow next to AllSkyFree
Delete AllSkyFree_Menu.cs from the Assets window
Glass and Reflection with Post Processing
Select Assets->Create->Material.
Double click the material in Assets below.
Change Shader to Standard (Specular setup) in the Inspector
Change Rendering Mode to Transparent
Change the Albedo color to Value 7 and Alpha to 15 transparent
Increase Smoothness
Drag a normal map from your Assets onto the Normal Map in the Inspector
Click the Fix Now button
Adjust the bumpiness of the map to the right, keep low
Drag and drop the material onto the model.
Reflection Probe for shiny glass and chrome
Select GameObject->Light->Reflection Probe
Change the Position to 0,0,0 in the Inspector
Make sure your objects are within the cube area. Use this editor to adjust. 
Change the Type to Realtime (default Baked)
Change the Clear Flags and Background color to match your camera
Increase Smoothness on Materials to change the reflectivity
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