Im 13 and I want to make games/apps, how do I start with a 1-4 hour limit per day??

Download touchdevelop. Its a great beginner app for those who want to make games. There's tutorials and all. It teaches you how to code. You can then publish your own code to the touchdevelop community or send to windows store. Touchdevelop is in the WP store and can be accessed online.

Hope this helps
 
You can start with the simple and popular programming language (C#) and making simple applications. When you will know the basics (OOP) you can try UNITY Engine