How to load angular module

I've just started using angular and javascript and I can't really figure out how to structure my application.

I started writing a Controller and my first reflex is to put what I would call my model into a class in a different file. I have different option

1 - putting everything (model + controller ) in one file

2 - using requireJS so my controller can 'include' my model. I've managed to do it, put it wasn't straight forward and I still have problem to make the yeoman dist version to work.

3 - use angular module, which seems to be the recommended way, but if choose this solution do I need to load explicitly my model file in the main html file. I understand that not hardcoding the dependency between files can be a good thing, so you can for example swap or change some components, but it seems wrong when for example a subclass need to requires its parent class. If I need to split a module in lots of angular submodules, do I need to load them all explicitly ? That's seem totally wrong.

Am I missing something ? what is the standard way to do so ?