Falkus, although not flavour of the month with some on this forum, has much of interest to say on the subject of saltwater fishing, devoting a chapter to tactics, tackle and flies etc on this in 'Sea Trout Fishing'.
Also Sidney Spencer's words of wisdom in 'Game Fishing Tactics'.
I think you'll find one of the critical factors will be the state of the tide in your particular location. This varies from place to place depending upon the local geography, e.g. in a wide and shallow estuary such as the Erne on the west coast of Ireland, a couple of hours either side of low water is the 'magic moment' whereas in Strangford, Carlingford or Dundrum on the east coast, high water is more favourable in the deeper waters. Suck it and see when you get there