its easier than you would think, IF you can find the fish. no need for expensive flies anything white works but if you want to catch anything with any consistancy you have to fish after dark.
we should be due a good season soon so pick marks where you can catch the fish close in on bait and fish the same places after dark with a fly.
for beaches try sandy bay, cresswell and hadstone.
rock marks try beacons, silver carrs, fluke hole, torrs at boulmer, craster, dunstanborough & all over at newton