[newbie question] first time trying mccc

If you just want it for townies' story progression, you need the main module (MC Command Center), the population module and the pregnancy module. All of the modules are zipped together, so just download the whole thing, unzip it all, and then just place the package files and script file for the three modules above into your Mods folder (they can sit one folder deep if you want to keep them together). Only the main module will have a script file. The other two are package files - so you should have three package files and one script file. The woohoo module won't affect townies - that's just for the Sims you're controlling.

I'd recommend starting a test save first until you've got the settings how you want them. Have a read of the documentation for those three modules here to see what the settings do.