Start out reading free tutorials and watch videos online. Invest in a C++ programming book and read it 3 times. Master it and code on your own.
Then take live taught online classes with an actual teacher and learn more of it. Then you will be ready.
Now you cannot create a game by yourself only knowing C++. Unless you want a stick figure game without any sound.
Here is a few things you need to make a video game.
and more depending on the game.
These are what you need to either know, be good at, or hire for to make a good game or something worth buying or playing. But if you just want to do a so so game that isn't much fun just to get experience, that's fine.
You might want to go into text based game coding. It's something you can do alone.