Well hello!
It looks like we have parallels in our modding adventures. I too have never modded a game before and I have been inspired to MOD thanks to this game and a few individuals on this board.
A few tips I have found which have helped me learn:
1. Download a MOD which is close to what you are trying to do and dissect it.
2. Read and then re-read and then re-read again the many tutorials on this board for how to MOD this fine game. For example, you are looking how to change item properties and create a custom item in your Goal #1. This link here:
http://www.lucasforums.com/showthread.php?t=143456) will give you much of the information you are looking for.
3. ASk questions. The only dumb question is the one that is never asked. There are many fine people on this board who will help you. Unlike some other places, they seem to remember what it was like when they first started out modding and will help you tremendously.
4. Make Kotor Tool your friend ;). Learn this program in and out. Just mess around with it if nothing else.
5. A good graphics paint program like Photoshop is essential for your Goal #2 re-texturing.
6. Get KSE (save game editor) as this has helped me find the ItemResRef that I wish to modify.
Now, to help get you started on part of your goal#1:
- Open Kotor Tool
- If this is for KOTOR then make sure you are navigating in the Kotor 1 tree and if this is for TSL, then make sure you are navigating in the Kotor 2 tree.
- Open the tree called .BIFS
- Open the tree called templates.bif
- Open the tree called Blueprint, Item
A whole mess of files all ending in the extension .uti should of opened up. These are the items that are in the game. Everything from armour, to belts, to implants to weapons.
- Double left click on one, it doesn't matter which one, and the Item Editor should of now popped up. There are four tabs across the top. General, Properties, Description, Comment. Take a look at these and see if any of it starts making sense. If you want to perform any permanent modifications, then you need to extract the file using the big Extract File button. Save it some where handy. If you want to open the file you just extracted, load up Kotor Tool, Click File at the top, click Open GFF files, navigate to where you saved the file in question, highlight it and click open. Remember, only modify a file you have extracted, you don't want to permanently change a game file!
Hope this helps a bit, and I can definatley give you some assitance if you have any more questions. Some of your later goals, like adding new plots and sidequests I haven't attempted yet, but perhaps we can share our findings and make life easier on the both of us.
PrimusPilus