If you can help it, please don't count on child support, it is generally an unreliable source of income at best. See it as a bonus if you can.

Working between 3-5 days, school hours on a casual wage plus centrelink I bring in around $1300-$1500pf inclusive without rent assistance one school age child. When I was paying rent I was paying $320pw on my own, my income was an additional $150pf for rent assistance. My big issue will be when I get shifted to newstart but hopefully I will have finished my degree by then.

I won't lie, its hard but doable. Budget, budget, budget. It will also depend on where you live, what your liabilities are and what standard of living you are wanting to achieve.