Mooching like that will do you just fine. Having a good depth sounder that gives you a lot of detail is probably the next most impertant investment youll need (besides the boat & motor). I usually fish plugs when I'm trolling because they will generally catch bigger fish. Dont hesitate to fish in shallower water. Some of my biggest fish have come from depths less than 70'. You also might try Jigging with darts and buzz bombs on the bottom