Hello Horses,
you're partly right. The whole thing is you don't have any line on the surface, your line is perpendicular to it. This will actually slow down your train, no drag at all. The heavy middle nymph will get the smallest one close to the bottom where the fish (read grayling) are. Start with two nymphs, you'll catch plenty of doubles....I mean two fish at once

. I stopped using three, too embarrassing to try and unhook three

. In fact I made up some sinker nymphs that don't catch

. As for indicators, like Alan says, no need. Maybe 1' of fluo green nylon just above the surface when light conditions dictate. Many don't like it, deadly technique. Steered away from it too, but unmissable when you're a competition angler.
Johan