Scratch is a block based programming language. You do not need to type code, but you just assemble projects with blocks of different functionality and configure those with simple entry of numbers and text. Scratch runs on a web browser and you can also interface it with some hardware. But where to start with Scratch?
The Code Club is a UK charity that promotes computer science for young people as yourself. They offer very comprehensive and detailed project tutorials, from small animations to a more complex RPG(*) game.
Here is the link to the site:
Code Club Project Create your own world
(*) A role-playing game (sometimes spelled roleplaying game; abbreviated RPG) is a game in which players assume the roles of characters in a fictional setting. Players take responsibility for acting out these roles within a narrative, either through literal acting, or through a process of structured decision-making regarding character development. Actions taken within many games succeed or fail according to a formal system of rules and guidelines. [Source: Wikipedia]