when modding a unit......

[PvK]

I don't think there's a way to give someone disease in a mod.

For a map or scenario, though, you can give them an item that will give them disease (e.g. Fever Fetish).

Ditto what Scott said about images. And the images so far don't include the attack image, so you need to go through the process of getting or making those.

PvK