Am familiar with the area.
Sandon river- the only town in nsw with no road to it. Either swim the river from Brooms Head end or drive up the beach from Diggers. A block of privately owned houses (no services). Camp grounds on north side
Diggers camp- Conjecture whether it was named after WW1 diggers or sand miners. A block of privately owned houses (no services)
Minnie water- More developed with modern houses, a camp ground and shop.
Wooli- A small town with pub etc. River has break walls.
The whole area is excellent for fishing, crabbing, surfing. If you're not camping, best to rent a house. They are cheap off season. Summer would be best with consistent northerly winds, though SE could work in some places as well. Careful of shoreline rocks around the headlands. Hope this helps