Obey all traffic signals and stop signs. Be aware of cars and other traffic, and ride safely. Other drivers often cannot see you. They are not looking out for you, so you must look out for yourself. End of Rules.
Most police departments are happy to help kids learn to ride their bikes safely.
Your pediatrician might also have some information or pamphlets on bicycle safety that you could use. Remember that you are the parent. You have a responsibility to protect and teach your child. You also have the greatest influence on your child's life. Above all, teach your child wisely.