Do you have a blood and sand worm fly ? Tthats what I used to catch flounder on in NJ, Manasquan River down near Belmar.
How about a clam fly got any of those, that was also one of the baits we used when I was a kid and had not started the conversion to flys yet.
Was in NJ two years ago, rented a beach house for a week in Lavallette. Caught a couple of flounders off the ocean rock jetties on rapala type lures when fishing for stripers. Sorry could not fit the fly rods in the van with the whole family with me. Borrowed my brothers spinning gear for the week.
No stripers caught, just two flounders. Good to back in NJ on the beach though and spent a day at IBSP, great place ever been there ? Good surf fishing when they are running.
I miss the ocean and salt water can you tell ?