[B]So I am wondering a few things... I know that instantly our PPP will cease (although I will get one payment on monday as I havent actually worked at all yet), and that if we over estimate our FTB will sort itself out.. but what about CCB????? Am I better off overestimating my income there too?? If I overestimate for my CCB and then do my tax and its different do I get money back?? And then alternatively, if I mess up and UNDER estimate and my % is wrong do I then owe centrelink or do I owe the child care centre????
PPP won't cancel immediately - you'll be asked to report every fortnight until you've had six fortnights in a row with zero ppp payment - and then it will cancel
in the mean time, you will maintain health care card, max ftba and max ccb

at the end, you'll be asked to estimate your income. the same estimate is used for FTB and CCB. i would always suggest over estimating - work out best case scenario for the week and use that as a basis. don't change ftb payment from yourself to your partner. it is a FAMILY payment - doesn't matter which name it is in, the FAMILY will still get the same entitlement

both CCB and FTB will reconcile and top you up at tax time if you overestimate, so it's safer to estimate higher than lower
make sure you are registered for child care rebate as well now that you're working