IFS lists insects, crustaceans, molluscs and small fish in the diet. For a practical starting box, carry a white streamer, an olive or black Woolly Bugger and a small nymph. IFS specifically recommends a white streamer for the Atlantic salmon fishing at Craigbourne.
A six weight is a useful starting outfit where the size of the released fish allows it; choose something stronger when the fish and conditions call for it. A floating line and an intermediate cover different depths. Fish a steady retrieve first, then vary the speed and pauses deliberately. Keep the fly moving naturally through the end of the cast instead of lifting it abruptly as it reaches the shore.