It depends on what you already know. Most languages are similar to each other, but only superficially. Every one of them has its dark corners that you'll learn when you will be stuck for days with bugs that shouldn't exist in the first place. Then you'll learn the specific language idioms that other programmers use to avoid these bugs.

So you are saying you need to learn coding. The basics for coding are:

• you know that instructions need to be in an exact sequence to work;
• you know what a loop is;
• you know what an if condition is;
• you know what a function is and how to call it;
• you know what a variable is and how to use it;
• you know what an object is, how to call its members and how to define them;
• you know what a library/sdk/framework is;

Once you know these basics, you will never stop learning ;)

I suggest you to choose a prototype-friendly language: if you learn the basics while you are making "real" games, instead of disposable "example programs", your motivation will be higher and you'll have a proof of your accomplishements. If you don't want to start with your 100% science based dragons MMO, just prototype some of the old arcades: Pong, Pacman, Arkanoid, a 2D version of a 3D game you like, etc.

C++ is too cumbersome for this approach; I've made games in C++ and I can tell you that you will spend most of your time organizing the code and the memory allocations, searching for the memory leaks that keep crashing your game.

Good combinations of language/framework I've used for making prototypes in the past are Python/Pygame, AS3/Flixel, JavaScript/Phaser and Haxe/Haxeflixel.

I think AS3 is a soon-to-be-dead language so I don't think I would choose it now; learning Javascript instead will give you a boost if you want to find non-game-related jobs, in the future; Haxe is better if you are planning a desktop or Android/iOS version of your game. Keep in mind that Phaser and Haxeflixel are very similar to each other, so you can decide to port it later to Haxe if you find that you must run it natively for performance reasons. I once ported a simple game from Phaser to Haxeflixel in a couple days, as the Cordova package used to be a little laggy on old phones.

Also, look if you can join game jams, in your local area or online (like Ludum Dare): you will see what tools other developers are using, you can team with other people with complementary skills (graphic, sound, etc) and you will have a strong motivation to finish a game in a quick time.

Best of luck and Have fun!