Our Heavenly Father has a plan for us, a plan of happiness. This is an essential concept to teach our children. They need to understand that where we spend eternity depends on how we conduct ourselves while we are on earth, especially since we are taught the gospel and are responsible to follow the teachings of Jesus Christ.
There are a bunch of resources for young children on my website, and they are all FREE! Some of them are these old Classroom Books that were used for Primary classes for children aged 1-1/2 through 8 years old. There are lots of useful resources in these books, and you can download as many as you want and look through them for ideas.