adding new civ or leader to core game?

I got hitler in my core game awhile back but I want to add iran north korea and iraq too... How do I add them to the core game? and I had to over write stuff when I added Hitler will I have to do the same for the others and would that over right hitler? Thanks ahead

 

Lemme guess, you play as america?

http://forums.civfanatics.com/showthread.php?t=148507

Here that will help.

 

I don't want to make one I want to download one then put it in the core of the game so I can play with them with a different mod

 

What you want to do then, is to add all the files to CustomAssets. These will be enabled automatically when you start the game. Firaxis (as well as the modding community in general) does not recommend you alter the base game files.

For example, you are going to have to change the XML to add new civilizations. So, you create your own XML/Civilizations folder for your changed XML files, which you copy out of the base game files, and then change to your liking.

The Creation and Customization forum will have specifics on how to do this...and the tutorial above should have all the info you need.

 

To each his own, I suppose.