What most naturally follows?

How to pray the rosary with a child
Sit down in a comfortable place with the child.
Eg: a living room sofa, etc.
Begin by praying the prayer to our lady of fatima, which is the introductory prayer to the rosary.
Demonstrate to the child on how to make the sign of the cross, and ask the child to do the same. Begin to recite the apostles' creed.