Nurse school to become Registered nurse. Australia?

Im 17 and grade 11. At the moment im doing childrens services cert.2 and psycology and socialology, and health and college. I want to be a RN and start a course to be able to do it soon. Im also pregnant with the baby being due november. will it be hard going to nurse school with a baby and in australia how do you go about becoming an RN. Do you have to do Bachelor of nursing first.?