I moved to Aus with my Australian partner, a few years ago.
I can't remember all the costs but keep in mind the cost of replacing things you don't ship over: ie, we didn't bring any kitchen stuff or furniture, apart from cutlery and some items that could be flat packed down. So everything had to be replaced from scratch.
We basically brought with us: clothing, shoes/accessories, books, pictures and personal/sentimental stuff - along with toiletries (me!), and some other small bits that would easily be stuffed into a box.
Also had to purchase fridge/freezer, washing machine, TV, all furniture and so on. Think of everything you use and then a) do you take it with you, or b) purchase it on arrival / gradually over time as you settle in.
It will be expensive! Think realistically about the visa costs (not just the cost you pay but the extras like requesting extra documents that may be missing (ie, birth cert), having things notorised etc... buying your friends drinks after they have written a declaration for you!). Then flights, any stop overs, the cost of renting somewhere temporary when you land (if not staying with family), groceries, all the stuff you will need - regardless if you are earning or not earning at the time. Then the admin, enrolling in Medicare, getting a local driver's licence, opening bank account, shutting down HMRC activities/opening up ATO etc. There is a whole list of stuff, none of it difficult, but something to be aware of. I
You need to do your research into the visa: the one you need is the 309/100 and you will have to jump through hoops and provide various supporting documents and written statements. It's not just a tick the box and wave the credit card type exercise. You as the applicant will have to do the most leg work, although your partner will also need to get involved (as your sponsor).