If you only have one customer contact, store this as the main contact. The main contact address will become your default billing and shipping address.
You can store multiple shipping addresses on the customer master.
You can manually create and add shipping addresses from the customer master.
Customer>Actions>New Shipping address
You can set a default shipping address (a checkbox on its record).
You can import shipping addresses using the Contacts import template.
You can find shipping addresses from the customer master.
The entire list of shipping addresses is displayed on a dropdown on all new sales transactions.
You can customize shipping addresses.