Ahh, theres a few tutorials to be found in the modding forums, have a look in thouse.
The way to code for the Unreal engine is: you open the editor, and then you need to export the .u files you want to work with, this will create some .uc files that you can work with in the main RO directory, which must then be compiled back into .u files when you are done and placed in the System directory (UCC does this for you).
Also, and this is important! NEVER edit any of RO's own files, if you do that, you wont be able to play online!
Allways ADD files, never edit existing ones.
And a last note: UCC wont compile an .uc unless 1) it has been described as an Editpackage in the RO.ini file, 2) if an .u file allready exists by that name.