Spinnerbaits, rapala floaters, husky jerks, big beetle spins, anything flashy will catch northerns up there. Be prepared to catch a bunch in the 20-24" range. Green is a good color. I've had just as much success without a leader as with, I usually have 20-30lb braid and have had maybe two or three bite offs. Another option to a steel leader is a heavy 20-30 lb fluorocarbon leader. Good luck, let us know how you do!