New Computer, Old Game

[[vL]Kp]

Anyway, what I wanted to ask is, what (in general) do you require to create your own more or less "mod"?
I know that it has sth to do with programming, hexing n stuff but specifically ??
I've always wanted well, lets say my "own" mod for this beautiful game but never knew where to start.
I'm not speaking about using tools like the Ez Modmaker, though I believe that it's great I rather want to do it from scratch if you know what I mean.
Perhaps someone could give me some tips.. I really wanna learn.

Mods are created through some combination of modifying the data tables to add/change/delete monsters/items and modifying the code to change game mechanics. EZModmaker knows the locations of the data tables. To change the code, you need to read and write assembly, and have a disassembler. Generally, most modders relied on one of a few high wizards to write the needed assembly.