I hardly ever fish a floating line unless I am using a floating lure, although I do use one fishing dusk up until dark with smaller flies doubles and singles size 10 down to 16's.
In the dark I will use full sinking lines from slow inter to DI5 if necessary or sink tips with different sink rates. Sometimes different pools on a stretch call for different lines due to their make up. I am a frim beleiver in getting down to the fish and not twiddling about on top with a floater and samll flies.
At night flies can be tubes, snakes waddingtons from 3/4 inch to 3inch, secret weapons and tandems also.
singles from a size four long shank down to size 8's although in long periods of very low water I will use 10's in singles and doubles.
Nylon before dark with smaller flies in the 5-6lb range and 10-12lb after dark.
As has been said put the hours in and you also need fish in front of you.
Depending on the pool I will fish pretty square across the river and will engage some kind of retrieve, figure 8, speed depends on speed of pool I am fishing.
That should probably do for starters.
Fish quiet and steady, keep your torch off the water
help me catch sea trout. please!!!!
Just to add, it took me around 70 hrs since march... but got there in the end. 
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