I already listed all the tools you need per mod category, including Item making in the Guide for the Newbie (
http://www.lucasforums.com/showthread.php?s=&threadid=129789) sticky. I also give basic information to get you started.
You can now do 99% of this stuff with Kotor Tool. Achilles made a good tutorial about editing properties and you can find it in the Do you want to mod SW-KotOR? (
http://www.lucasforums.com/showthread.php?s=&threadid=124284) sticky.
Please read the stickies before posting this kind of general question ;) Afterwards, you will be most welcomed to post all the questions you may have concerning KotOR modding.
Unfortunately this thread has to suffer the same fate as any other similar thread:
:lock:
P.S. and Hybris, your sig is quite long, would you mind to shorten it a little please? It is a little annoying to see a sig that takes more than half a screen with a few liner posts ;) (would have sent you this by PM but your PM system is disabled).