For spinners I either use a bottom bouncer or 3 way rig with 1.5 to 2.0 ounces of weight to get down to 35 feet if need be. Some guys prefer 3 way rigs over bottom bouncer but I have not noticed a difference in the amount of fish caught using either of these. I use leader lengths from anywhere from 3 feet to 11 feet if necessary. Most times for me it seems like 4 to 6 feet works fine. I typically go from about .8 mph to 1.5 mph or so. I typically use silvers when it is sunny and when it is cloudy I use either gold, copper, or a bright green or chartruese.
For cranks I typically either troll them on leadcore if I want to get a small lure down deep or I troll a large bait such as a reef runner or deep tail dancer which I typically run on planer boards or I flat line them.
Hopefully this answers a few of your questions.