It's great to see your enthusiasm for creating mobile apps. While Blender is an excellent tool for 3D modeling and animation, it might not be the best choice for developing 2D Android apps, especially if you’re looking for functionalities like page-flipping animations, and audio/video playback.

Blender's primary strength lies in 3D content creation, and although the Blender Game Engine (BGE) allows for some game development, it's not ideal for building 2D mobile apps. BGE is more suited for 3D games and has limitations regarding the kind of interactive elements you described.

For creating a 2D Android app, especially one that needs to include animations and multimedia, you might consider using dedicated app development tools like Unity (which supports both 2D and 3D development) or Godot (which is user-friendly and good for 2D projects). These platforms offer better support for the features you're looking for and have extensive resources and tutorials available.

If you specifically need a prototyping tool, tools like Adobe XD or Figma are great for creating interactive prototypes and might suit your needs better.

To directly answer your questions:

Creating a 2D App with Blender: This is not recommended due to the tool's primary focus on 3D.
Exporting to .apk: Blender does not directly support exporting projects as . apk files.
For tutorials and more detailed guidance, looking into Unity or Godot would be beneficial. They have strong communities and plenty of resources to help you get started with your project. Good luck with your app development journey!