Not really sure what you mean by "script with G.exe files"... But anyway, if you're looking for basics, the best place to start reading about C++ is here: http://www.cplusplus.com/doc/tutorial/

If you've scripted in GS2, then you're going to find it slightly easier to pick it up rather than learning it from scratch, as a lot of the keywords you used in GS2 are used exactly (or near enough) the same in C++, and you'll find it easy enough to write a few basic console applications using this knowledge.

If you've got any questions and you can't find an answer to them by using Google, I'd be happy to help.