Welcome to the site. Good luck, hope someone takes you under their wing and shows you how to fish those beaches. Best advice I can give is to just get out there, find a gutter and get some fresh bait (squid, pillies, worms, prawns, nippers, crabs, pippies, chicken etc.) in the surf and you'll be in with a chance of pretty much anything - bream, flatties, whiting, dart, rays, jewies, salmon etc. About SP fishing, whereabouts in the harbour are you talking about? Just the harbour itself or the waterway such as the Parramatta river? Also what fish would you be targeting for that?