Understand that the jump to making a game from making a mod is an astronomically huge jump, unless you plan on making a really simple and tiny game.
As far as I know the most similar language you'd want to go toward is C#. I hear it has a pretty low learning curve. But depending on the game you want to make, the language will depend on the engine you use (unless you plan on making your own engine, in which case god help you you're on your own and this will be near impossible). If you're planning to make a Torque-based game you'll need to work with C# and C++ probably at times I think, but I'm not an expert on Torque engines.
