It is late in the season for harbour fishing now so you may not catch too much. Still, better than sitting at home. Your most likely 'edible' catch is still going to be a 30cm Snapper or maybe a small Kahawai. Personally I would use circle hooks in the 6/0 size. 1kg of bait should be enough. Squid is OK at this time of year. Make sure that you are down there over the higher part of the tide and preferably over high tide itself if you can. It can get pretty rocky down there at low tide and people often go out to fish off the rock ledge that gets exposed so they can cast into deeper water.

Can't help you there but 40 years ago I used to surf cast off Pt Chev beach and catch Kahawai over the high tide in summer. If you are going to fish any of the Manakau beaches I would try when there was a high tide at the change of light and use smallish baits on maybe 5/0 circle hooks for Gurnard and maybe Kahawai

Fun to use a trout spinning/softbait outfit if they are chasing small fish. Cast small silver lures and or softbaits. Wind fast , kahawai like to chase their meals.