depends you could need a net either drag or set. or spearing them. in which case this time or year i would recommend waders or a wetsuit aand booties a flounder light and a spear. rod i would say a light rod with sensitive tip light line up to about 8kg maybe small hooks on a running rig or with a sinker at each end of the trace. bait would be worms/shellfish/yabbies
when i was a kid i’d catch them on worms or mixed vegies from the freezer (throw in a handfull as ground bait and make up a ledger ring with multiple small hooks making sure they lay flat on the bottom. this method works good when the tide is pushing over new ground , the flounder push forward with the water picking up what they can find).
that way is good fun other than that like the ginga said spear and net.