Also, you'll find it more comfortable if your depth finder is mounted on the bow with the transducer attatched to the foot of the trolling motor. If you have only one depth finder, mounted on your console, then keep in mind the depth being shown is for the stern of the boat, not directly under you and your trolling motor. Get to be best friends with your depth finder, for structure fishing, it's the most important peice of gear you've got. Most of the time, you'll find the majority of the fish on the top lip of the structure. The rest of the time, you'll find the fish suspended just past the lower edge at approximately the same depth as the upper edge.
Boat position is the key to effectively fishing the structure.
Run up and down your structure a time or two and get to know the rate of the slope and where it bottoms out at. Position the boat so at a full cast length, your lure is about 10 over the top edge while holding the boat in deeper water. Keep the boat at the same depth as you follow the contours of the structure. If you find a narrow cut, back off and fish the bottom of the cut as well as moving in and fishing the surrounding lip. If you move over a point, make sure to go back and fish the normal edge line across the top of the point as well as following the point out into deeper water.