based on the fact that you reference "8 new units folders" for the game pack, I can see that you are trying to setup the PTW version of the game.
(some of this informations is inside the readme.txt file in your game pack)
The key issue for you is to be able to locate two different folders:
the folder where the units go will generally be located at:
C:\Program Files\Infogrames Interactive\Civilization III\Art\Units
the folder where the "pediaicons.txt" file will nee to go will generally be located at:
C:\Program Files\Infogrames Interactive\Civilization III\CIV3PTW\Text
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Extra graphics that you need can be downloaded from the "Loading the Graphics Packages" section in the middle of the PTW setup instructions webpage at:
http://gotm.civfanatics.net/games/gotm19_start_PTW.shtml
The reason these graphics are dowloaded in separate groups is because some players already have one or more of the prior games graphics packages already installed.
Let me know if you have any trouble locating or dowloading any of the graphics packages and I can email them directly to you if you contact me at
gotm@civfanatics.net
Welcome to the game and we hope you have fun.