One fish, for example the flounder, is primarily a "sit and wait" ambush style predator. The tide is your friend with this animal, what you'll be looking for is something like an inlet, oyster bed, reef, some type of structure that will hold feed.
Next, you want to hit these structures that will be near a drop and be below the drop as the tide flows over the "edge" of the drop. The feed and everything will be forced off the drop and settle on the bottom because the smaller stuff is too weak or they fuck up and get blowed off. The flounder will wait at the base for things to blow down and then the things struggle to find shelter in those areas.
This is just one example of how to fish these organisms, I'd go with a bottom rig that has the sinker on the bottom, pretty big sinker, and then up the line a bit (2 foot or something) have your hook where you hook up a live shrimp or finger mullet. I don't know the names of these rigs, just how to make them.
The absolute best place to catch these fish, which you don't have access to it sounds like, is the outside of an inlet on an outgoing tide in the "wash out" area. The inlet blows all that shit out to the ocean and it settles out as the small feed in the bay gets swept out and everything just waits out there for shit to fall into their mouths basically.
It is as old as they say "think like a fish." Just imagine where the easiest meal is and you'll find them. They want to just sit there and basically have shit fall into their mouths, find those places. EX: giant boulder in a creek, the trout sits behind it in an edy and waits for little macroinvertebrates to fall out of the flow right into his mouth.