Lots of good advice here, but you might also want to consider trolling with night crawler harnesses. Fish them with jets, small dipsys or 2-3 oz. of weight, then off planer boards. or flatline, or off downriggers. usually slow, 1.3-1.8 mph. they work shallow, mid-range and deep. I used to troll just spoons, but switched two years ago when I figured out harnesses worked better for me. The only problem is you are always reeling lines in to re-bait if you don't hook up.