Tidal River Help

looking for help figuring out how to fish large rivers with slow currents the one in particular has cypress trees extending out from the bank varing from a few feet to 40 feet most spots drop of 20 feet from outer edge. almost the whole river looks the same except for the occassional boat dock seems tidal and level effect fishing the most. cannot put any patterns together only catch a few early or late. river might be 20 miles or so long and empties in lake pontchatrain just n of new orleans need some tips with tidal bass thanks