We used planer boards on Table Rock. We use Offshore Planer boards with the Tattle Tale flag.
Basically you tie on a crankbait, spinner or other to your line. Dip the bait into the water.
Then you let out as little or as much line as you want (you can get information from manufacturers on how much line and at what speed your crankbait will dive to)
You then hook the lines to the planer board clip. Place the planer into the water and let out as much line as you want to get the board away from the boat.
I recommend using a line counting reel with each planer board. When you catch a fish, you can duplicate the set up again to achieve the same depth.
You can troll at 0.5mph if you want to. You can add snap weights in front of the crankbaits to keep the baits down at slower speeds.