Lutheran Hour Ministries has created a series of brief courses called Learning Library. It is full of brief lessons on the fundamentals of the Christian Life. You can access all of them at LHM.org/learn.
Teaching and learning to pray in the home is a great place to start and explore these growth opportunities together.
Click on Christian Foundations and create your free account.
Then click on 5 Ways to Pray with Your Child and enjoy the 4 sessions.
Here is a pdf of 5 ways to pray.