Sotanaki

Hey, I'm actually new to modding, and I'd like to know where to begin. I have rather decent knowledge in C, Java, and I'm starting learning C++. (I'm a computer programming student) I've been looking for modding tools, because I suppose that's how I'm gonna have to start, but I can't find any, only articles on how Techland is going to release them soon. However, I already see lots of mods out there... All I want to do is begin slowly, tweaking up some stats, make my own custom difficulty modes, things like that. Again, I'm completely new to modding, so please forgive me if I've said stupid things (also, I'm not English :P) Also, sorry if I'm not in the right section, a redditer suggested this website for me and that's my first time here :D