It sounds like you already have a fair handle on things, there are a lot of tools required for modding the game currently, depending on what exactly it is you wish to do.
Personally I gathered them all and poked around until I decided which ones I needed over any other, that turned out to be the majority of them.
In the tutorials I wrote is a link to a 2 hour video / stream that gives a rough overview of KotOR modding, not sure if that might be of any use to you.
Alternatively I would primarily suggest
KotOR Tool
K-GFF Editor
2DA Editor
ERFEdit
TLKEdit
Dialog Editor
KotOR Toolset
KotOR Find References Utility
There are a fair few beyond that that I have, but these are the main ones I use or have been using up until now.
And of course there is also KLE ( KotOR Level Editor ) which is a fantastic new tool which has made life a lot easier for modding the games and is no doubt going to end up a very powerful tool for modding these games.
Hopefully that might help guide you in the right direction, though it sounds like you would have found your way to the right tools on your own eventually
Thor110