Ahh. Okay, that sounds like it could be an issue with the patch rather than the mod then. First step, reinstall RTW and get that working; if RTW doesn't work then nor will WHTW pretty much by definition!
By the command line I just mean the target: line on your new WHTW shortcut, which you can find by right-clicking and hitting properties.
To take screenshots, press the print screen button on your keyboard, open paint, press Cntrl+V to paste, save the file, then either find an image upload site or I'll message you my email and you can send it to me that way.
As I say, though, don't worry about any of that until you have a working Rome: Total War to start with - WHTW still borrows many of its files from the original game so having it work is vital!