In New South Wales, before advertising your property for sale (excluding rural properties of more than 2.5 hectares), you must have a marketing Contract prepared and held by the agent.
This will have up to date certificates from Council, including a zoning certificate (new Section 10l7 previously known as Section 149) and sewer connections and mains diagrams. Also attached will be a title search (if for a unit there will be one for the common property and one for your unit) plus by-laws and any dealings mentioned on the title search. All contracts for sale of land must now include copies of swimming pool (and spa) registration and certification and copies of any relevant leases (even for residential property).
You need to ensure you have the correct documentation and do not leave yourself open to purchasers being able to rescind the contract because it is not complete.