I've never made any mods for games before, so I thought I'd start with Powder Toy. I just have no idea how to make the mods... If anyone can help or provide any tips on how to make mods, I would greatly appreciate it. Thank you for taking the time to help.
Generally you can either start with LUA (The easy way), or C++ (The hard way)
C++ happens to have a LOT more possibilitys, and is faster as C++ based mods are directly compiled into the game.