Hey mate welcome. Fishing in Sydney's awesome, but occasionally it is tricky to find out what works and doesn't in different conditions. Just keep at it and you''l be in for a feed in no time don't worry. If i'm land-based i'll usually have a look at the satellite map the night before for good looking spots for your target species (rocky points, sand-flat drop-offs) and generally try to avoid highly fished areas like boat ramps. Good luck mate