I am new at modding the game and I don't know where to start. I was wondering what tools I should use. I just want to try to mess around with items and maybe do some skins. I tried out the fred tetra tooll because I heard it was good, but I couldn't figure out how to use it. I was also wondering if anyone had the source code. And can anyone tell me if I need to know programming like c or c++?

look at the stuck threads at the top

like this one...

http://www.lucasforums.com/showthread.php?s=&threadid=124284)

:)

About Kotor tool: you need to install microsoft .net to be able to run it. About how to use it, i suggest you read the Readme prepared by Fred Tetra. Then if you have more questions concerning this, I'm sure people will be happy to answer them.
Depending on what you want to do, you may not need any knowledge of coding. If you only want to do some skins and items, that won't be necessary. You may want to get a GFF editor. I suggest these ones:
http://nwn.bioware.com/developers/erf_download.html)
or
http://users.servicios.retecal.es/fsantosjal/NwNEditor.zip)

For skins and textures you'll need photoshop or paint proshop.

You can find some scripts in the BIFs>scripts>script source

If you want to get into this, don't forget to check out nwscript.nss it's full of ressources.

To compile scripts you'll need HazardX script compiler:

http://www.megamods.de/_data/parts/dl.php?file=37)