Getting started with Meteor 1.3, application structure

We all know that in Meteor 1.3 we get new package structure (?)
There are few tutorials on how to get started with meteor 1.3, for example:

But I can not find how to get started with new modules. Make it isolated, import it. How my application structure should look like after all?

What I realise so far, is how to use npm modules:

npm init -f

and then install modules and import in my code like this:
cloudinary = Npm.require("cloudinary")

What if I want to use my own modules to break my application on parts? Where to store it and how to create?

PS: Never created modules other than meteor packages