Many source to create design game. One of all that must to know how to process from beginner to expert mode. Basic Software Game 2D or 3D right now make help us to know how learn that software. Become expert is not easy. Many things to build model and character for data sample to move it. After build a character, the coder make script and syntax for step interest. But, any software shouldn't create and build a game with script and syntax. In my experience, any software just make a game simple mode.
1. Introduce that software.
2. Search tutorial that software.
3. Build game in your imagine.
Many software you can learning by doing. Just typing a keyword to search engine : software game, how to create a game.