Offering an effective delivery method is a plus to your customers. Giving them choices on a delivery method they like can maximize their interest and increase your revenue. In Odoo there are pre-installed delivery methods like UPS, FedEx, DHL. You can configure this in the eCommerce> Configuration> Settings. 

However if you would like to create a new delivery method. Simply go to eCommerce Dashboard > Configuration > Shipping Methods> click Create.

Fill out the fields and click Publish to reflect on your eCommerce website. it is simple and easy to add a delivery method in your Odoo eCommerce!