There are a lot of good beginner guides and tutorials for the hacking aspects over on
Romhacking Dot net. Unfortunately, PS1 and PS2 (along with many other platforms) are still pretty uncharted water for a lot of stuff (basically, unless you get all super techy, you'll pretty much find yourself limited to the initial capabilities of the game and whatever formats are either already documented by others or evt. easy to figure out and documented by yourself)
As for ToD2, there's actually actually a sub-board
here for public translation efforts, where segments are put for translation/proof-reading/etc... It's a bit slow as people haven't been too active lately + there are other things on Cless's end that probably should get attention first (*cough*ToP*cough*), and there's also some stuff for it that's currently in my filthy hands

(Damn! I need to find some motivation in a can to finish that, as I too have been distracted by other nasty little things.)
Anyway, the translation forum isn't very organized (Don't blame me! But then again, Cless seems to be on top of things going on in there.)