Done the trip many times, and Did a similar trip in a similar
boat at a similar timeof year. My previous boat was a Kendrick 9 mt tri. It was in Port Macquarie (not lake macqauaire)when I bought it and I sailed it to Brisvegas after
purchase. Did Port Mac to coffs in one day light run and then coffs to
brisbane overnight.
Winds should be predominantly south east by then, but your distance is short enough to have a good window
forecast.
The East
Australia current is south setting and location varies but if you stay inside the 50fathom/100 meters
depth line you will miss most of it. Gung ho racers will hug the beach - my track on that
delivery trip had me around 30 meters
depth mostly.
Officially chart AUS 812 indicates a 4
knot south set at the 90-100 fathom line.
a good first day may be Lake MAc to port stephens - short and easy. A long second day would be to Port MAc and then its a long easy day to coffs and Its a nice easy (longish) day from coffs to yamba as well.
Lucas - cruising the nsw coast would be a valuable pre read. It has excellent info on bar entrances and the unique nature of each of them and is a good planning tool.