Well, have you modded any other games in the past? Have you played with WallMarket or PrC or other tools here? I think that starting by reading through the Tools Thread, picking the ones you are interested in working with, then practicing with those is the first thing you should do. Read through the Wiki. Get CDmage and start taking a look at the folders and files in FFVII psx (if you want to work with PSX version - doing so is more limited, but personally I think it does a greater service to the gaming community). After you've spent a few months with these, you'll be in a much better position to contribute. If you're an experienced modder on other games, then it depends on what level you want to work. I'm not a programmer or a 3D artist or an audio engineer...so I mod the big files in the game with tools that others have made. I don't really have much knowledge of the deeper inner workings of the game. You can learn everything you need to know by scouring the threads that are already here. I can point you in the right direction, and I have decent knowledge of the functions of WallMarket, Proud Clod, Libre, Loveless, and a few of the obsolete tools, but that is about it.