How to pick a school for my child?

Hi guys My child is in kindergarten and next year will be going to school, as a migrant I have no idea how the Australian education system works and don't know how to pick a school for my child? Is there any sort of guide that explains how it works? Are the rankings important? What is the first step, I was told that I have to apply/enrol my child next month , that is all what I know so far Thanks