It's nice to have the C++ code, there is plenty of documentation avaliable, and look up normal C++ tutorial's, also steamworks steam achievements FTW, and if your serious about your game, instead of just using LUA, try and port your LUA stuff to C++, to allow the player's to use your LUA for modding mosty instead of craming the functionality in LUA, you will also need the C++ code if you want to implement more complex stuff such, as lipsyncing, or ragdoll's to the engine and more, etc

It's nice to have the C++ code, there is plenty of documentation avaliable, and look up normal C++ tutorial's, also steamworks steam achievements FTW, and if your serious about your game, instead of just using LUA, try and port your LUA stuff to C++, to allow the player's to use your LUA for modding mosty instead of craming the functionality in LUA, you will also need the C++ code if you want to implement more complex stuff such, as lipsyncing, or ragdoll's to the engine and more, etc