See... what you do is go out about 25 miles off shore, right? You let the engines idle. Now, the best speed is between 3 and 7 knots. Depending on the fish, I personally like Mahi Mahi (Dolphin), is where you want to go. For Mahi Mahi, they like to stay around floating seaweed clumps. Since that's where they feed. So you simply let your bait trail a good distance so that it's not caught in the engine's wake, and far enough so that there'll be no disturbance from the boat. Then you just wait, and drive in circles. BAM! It'll hit, and you reel in.
That's how you properly troll.