Training your kid requires caution and a patient approach to avoid injuries apart from the occasional falls. You can start on a carpet in and around the house to teach balance and stability. Once your kid gets the grip of the basics you can take him to a less busy road to learn some tricks and controls. You can also take him to the increasingly empty skate parks around. In a skate park, you get to worry less about injuries and he gets to probably meet people that can train him better.