most guys longline back of the boat 50 to 100 feet. 10 lb line mono,control depth with lure choice and speed is very important. try something in the ranger of 1.5 to 3 mph (gps) keep changing till you start gettin fish. start out with 2 or 3 rods till you get goin to keep tangles down. learn this simple method first , then you can always expand to boards,snap weights, down rods,lead core, lots of ways to troll crank baits.
good luck and let us know how you do.