Adding a basic Content Type

First create the model in

/fuel/app/classes/model

The class definition can extend a bunch of base classes located here:

/fuel/packages/cmf/classes/CMF/Model/

All must derive from this if you don't want to extend one of the other types

/fuel/packages/cmf/classes/CMF/Model/Base

e.g.

class Model_MyNewClass extends Page {

You can then add your custom property fields...

/**
* @ORM\Column(type="integer")
*/
protected $price;

The comments above the property are important as they define what the property is in the database. More information can be found here and more examples here