There 3 primary elements of creating a game.
1. Design - Normally pretty straightforward, but you should put good amount of effort into the design of the game before doing anything else.
2. Media - Essentially creating all the 2d images and 3d models and so-forth that you will need in your game. Creating 2d media is normally considered a lot easier than creating 3d media, so for working on your own I would suggest just tackling 2d media.
3. Programming - Writing the code for your game. I don't know what experience you have with GUIs/Graphics Engines in C++, but it will be necessary to implement something along those lines in your C++ code. I would suggest staying away from implementing anything that is platform-specific. Also, you shouldn't use anything too outdated or deprecated (like graphics.h)
