Trying to understand something. I have to create all the Gold Alien Races first and then bang the game before they will work or can I add them later in the game?

you can add them later and have them take affect as long as you set the race as active....Creating them later in the game though can make them weaker because they will not have had time to gain experince and resorces...My suggestion is if you are going to create a race after the bang is to leave them inactive untill you are going to rebang the game.
Strider