To create new magento shipping module one need to know all the useful functions to be used inside the shipping method class to put in various configuration options.

When looking for available shipping methods, Magneto first gathers all available carriers. A Carrier represents a shipping carrier, just like in real world (ex. FedEx). Each carrier is represented with the class that extends Mage_Shipping_Model_Carrier_Abstract.

Following are required steps to create custom shipping module or configure the module as per our requirement.

1. Register the module:- It is necessary to register new module as below.

app/etc/modules/namespace_customShipping.xml 
<?xml version="1.0"?> 
<config> 
  <modules> 
    <Namespace_CustomShipping> 
      <codePool>local</codePool> 
      <active>true</active> 
    </Namespace_CustomShipping> 
  </modules> 
</config>