You can load Magento model using the following code:
Mage::getModel('modulename/modelname')
Example:
Mage::getModel('catalog/product')
This will load Mage_Catalog_Model_product
To create a new model in your module Add a folder Model in your module root folder and create a file Modelname.php in this folder.
for example Rick/Demo/Model/Modelname.php
The class name of your model does matter call it like this:
<?php
class Rick_Demo_Model_Modelname {
}
make sure y...