Hi Anroo,
I would go up to the entrance and have a go under the Hwy Bridge there or in the channel near the mouth, whiting seem to be on the bit, and always a good chance for Flat heads and Breams. Good luck. Try to fish the Tide changes particularly low tide for whiting.
If you are willing to travel further, and have a boat, Lake Macquarie/Swansea is a great fishing location, or in Tuggerah Lakes there at the entrance can produce some big fish.
Further south, you can fish in the hawkesbury river, Patonga beach off the rocks there on the northern end.