ToolBox for Faith: 

This online Confirmation curriculum ( https://toolboxforfaith.org/ ) is free and written by people in the Lutheran (ELCA) tradition for youth and their mentors, but you may find it of interest as well.  You will discover explanations of basic faith understandings in their lessons on different parts of the Bible, the Old and New Testament, the Catechism and in Apply Your Faith (worship, service, mission, and spiritual development).