I find that I get free units randomly when I take a city or do an action. Could you create a concise and clear list of free units and events that can or will pop up through-out the mod?

I like the idea of a list of goals, such that the Martian Home World would maybe give you a time limit to complete the goals or by completing the goals, you are rewarded by Home World. The over arching idea is that by completing all the goals in an orderly manner you are able to in the end colonize Earth and get The Cure.