Hi Mike
The fishery averages about 5 ft in depth and for most of the year a floating line is all you need. No need for really long leaders, keep it simple and about the length of your rod, so about 9ft is the norm and some folk possibly go up to 12 ft.
Being very sheltered the water is frequently calm, so casting presentation is far more important than casting distance
If the weather is overcast, you will hopefully get some dry fly sport with Klinks and CDCs, but wee damsels, crunchers, spiders, pheasant tail nymphs, Diawl Bachs etc in size 14 and 12 usually work well just sub surface, as do classic wet flies.
Hope this helps!
Best wishes
Mike