Hey Aussie Mum, I too am in Australia and went through this last year.
You have pretty much covered everything - the solicitor will want details regarding debt, assets, superannuation, salary, current arrangements for the children etc.
If it gets nasty, be prepared for his side to question your income, and state that you could earn more if you really wanted to. If there is an argument for spousal support, this is when it will all come into play, depending on the age of the kids.
As you know, Child Support payments are either done privately, as guided by the CSA, or administered by the CSA. It depends on what works best for you.
You may be required at your first meeting to give an affidavit as to what led to the breakdown in the marriage as this will be included in the divorce documents.
Your solicitor will probably ask you whether you are prepared to enter into a Parenting Agreement, which will formalise your arrangements for the kids. While this is not legally binding, it is very good documentation when things go wrong.So it would be good to think about what to put in there, such aas medical costs, school holidays, first right of refusal, how to communicate issues about the kids - whether you have a right to know where they are, etc.
60/40 is a reasonable split, and very achievable I would have thought. Looking at a lot of court documents and reports, it certainly seems to be the norm in most cases like this. However, maybe have a think about an ambit claim, depending on whether this would just be inflammatory or not.
My best advice is not about the process, but how you deal with the process. You seem very level headed, but its worth remembering that this can make you feel like shit. Dont be surprised if the other side makes remarks about you, your icome earning capacity, your "ridiculous" demands, your care of the kids. Remember that they are being advised by him, and they are trying to get the best deal for him. But it burns to know that he has sat with some dude in a suit talking shit about you. so, keep your eye on the outcome, and try not to let it get to you.
Above all, think about what you are seeking to achieve - financial certainty and security for your children. Yes, its about you and what you deserve to take away from this partnership, but whenever you are accused of being greedy and after his stuff, remind yourself and him that this is for the future of HIS children.
You supported him and his kids while he earned that big salary and stacked away his super - its yours too.
Good luck, and let us know how you go. Feel free to pm if you need to.