Hi Helmsy, Rowboat Bob's method is as good as any and is probably the most popular method used.
We do it a little differently. While we will have a tootle around looking for fish sign we won't be too bothered if we don't find any if it's spring time. With little structure there is nothing to really hold fish. By using baits the fish will come to us once a few baits have hit the bottom. They way I see it is imagine two similar sized areas, one that's flat with say 20 snapper in it randomly spread out. That's the west coast The other sea floor is the same size but has a couple of rocks scattered around it, with the same amount of snapper congregated around each of the rocks. That's how I imagine the Hauraki Gulf mostly. Of course that's just my analogy and nothing quite like it really is but my point is that there is little to hold a bunch of fish in one spot - there's just a heap of them all spread out all over the place.
Anyway, after all that BS we always anchor and generally use light gear. I use 10lb braid with a 20lb leader for jigs and I'll use 60 to 120g jigs in those depths. If I use baits which I generally do, I'll tie a 60 to 80lb trace, usually just a two or single hook dropper with an 8/0 recurve hook. We tend to use just single hooks these days. We use 4 to 6oz sinkers.
Just with jigs and softbaits, they work very well at this time of the year, but from an anchored boat once the fish find your baits, as long as your mates are still bait fishing the snapper will smash your lures.
As Rowboat said, burley is great but be prepared for tope and kahawai to turn up. Burley will get the fish in quicker but yeah there is a price to pay and we use it more when fishing the shallows, but once the fish get a whiff of your baits they generally stick around. On a good day it's not too uncommon to bin up in an hour or so - especially with heavier gear and 2 hooks.