Hey Gattuso
Numbers are a lot different for community title (I've only done torrens title so numbers below reflect that) and may be slightly different in certain sections. Find the council maps or talk to council / surveyor for info on which sections.
But general torrens min in the area is 300sqm for the newly created and 9m for the width. You can submit/apply for differently, the council seems fairly workable / compromise-able in some cases. I have one that is just above fitting 3 on it in terms of sqm size, but a little under being wide enough. They seemed happy to discuss further depending on what plans looked like.
My contribution for the one I've completed (called an Open Space Contribution) was $6500 total for a 2 lot into 1.
Not really sure on distances for easements / boundaries though sorry. Your best bet would be to contact a surveyor and tell them your property's address and they'll look up what can be done. The one I used is called Sawley Lock based in Prospect who was more than happy to come to council with me to discuss, or provide their knowledge on the rules. I used Max Sayer who is a Director there, tell him I sent you if you want.