Short term:

Free public transport.

Free bikes for everyone.

Begin emergency repairs on any old busses that can be pressed into service.

Implement a priority system for who gets fuel:

Tier 1: healthcare, emergency services

Tier 2: food production & distribution

Tier 3: essential infrastructure (power, water, telecoms)

Everything else: on yer bike, son (or heavily rationed)

Ration fertilizer. A lot of it is wasted, currently.

Daily govt briefings - what's happening, what is being prioritised, what people should do. Maintain clear communication and transparency.

Medium term (but start NOW):

Electrify all busses.

Trams. Melbourne is going to need a lot more of those.

Repair neglected railways.

Move freight by rail and ship as much as possible.

Build cycling infrastructure. Secure places to park many many bikes next to train stations - big sheds.

Remove regulatory barriers for local food production, farmers markets. Encourage urban gardening, local trade networks.

Plant corn fucking everywhere - ethanol.

Strategic reserves of critical medicines, etc.

Diversify food production - for local needs, not for export market needs.