If you plan on enrolling your child in school, you will need to apply for a student visa for your child. If your child is awarded a student visa, you can apply for a guardian visa, which is attached to their student visa. You cannot work on a guardian visa. There are many different options for visas, so I recommend doing some extensive research to determine which one works best for your situation. If you are over 50 you could look into a retirement visa for example. Good luck.