Purchase a spool of quality monofiliment line in the 17 to 20 lb. class. This will be used to tie the leaders which can vary in lenght from 15 to 45 feet. A number of 20 and 40 foot leaders are recommended for starters. Make a couple of 20 footers, winding them onto the same spool, then make some 40 footers. This completes the basic set-up and all that is left are lures.
Lures change in popularity all the time so again, listen to the people at the tackle store.
Currently, the popular styles include the body baits that imitate minnows in both shape and action. Also, consider some of the recommended spinner style lures which usually require the use of a minnow or piece of crawler. Other lure styles are available and some can be very productive depending on the time of the season. Mount the reel as close to the front of the boat as possible and near the the edge, Some boats allow mounting to the front seat, but if this is not possible use the gunwale. Serious deep-trollers fix a thin board to the front of the boat for mounting reels.