Hi selleyp.
If I was you I would take the advice of the bailiff on the day, Ivan and other guy who works there are both very helpful and want you to catch fish and return to the fishery. There will also be some updates on flies and techniques on the whiteboard in the lodge opposite where you sign in !
In a nutshell I'd say that most of the main basin should fish well and it will be worth a look "up the arm" as the locals say; first choice flies will be black, green, or black and green, both nymphs and lures; and the fish may well not be down too deep.
I use good old Maxima Ultragreen for reservoir leaders - 5lb point for nymphs, 6lb for most lure fishing and 8lb for very deep fishing or extra large flies. Maxima has never let me down - you could almost tow a car with it.
One other thought, if you can get a copy of the November 2010 FF & FT, there's an interesting article by Charles Jardine about Ivan and the lake....
http://www.flyfishing-and-flytying.c...k_issues/2010/