Welcome aboard, ObieWan, ah, errrrrr, I mean Kinobi
What Mr M wanted you to do was click on the link to his modding tutorial below his signature. You can get to the same place by clicking
here
After that, try to read around some of the threads that start with [WIP]. That means work in progress. You can usually see how some of the files are changed in those threads. Then, when you really get adventurous, download S3D (see it's thread in the sticky section at the top of the forum) and start poking around in the files to see what's in there and what changes in a mod from the stock files.
Then, make sure and get the name of a good psychiatrist and reserve about 3 months worth of therapy in advance:rotfl: