How do I implement new units?

[Timchy]

I foun a whole stock of CTPII units and downloaded them. I rad the readme.txt files and did what it said I should do. But I didn't even understand what the txt said. And it didn't work. So PLEASE can someone explain to me in simple well described steps what am I to do to play with extra units? Thank you

[Locutus]

Here is a step-by-step guide for adding units. If you get stuck anywhere, feel free to ask for more help...