Your first step in locating the fish is to find water over 30 ft deep. Let's talk about downriggers for a minute. Start with a manual unit until your budget can afford at least one electric. You will need at least two downriggers on the boat mounted near the rear quarter on each side. You want the fish to strike and release the line from the clip.
Stripers feed UP never down.
For example your lure runs about 3 ft deep, the fish are at 30 ft, let the weight down to about 25ft. This will put the lure 2-3 feet above the fish. Don't troll in a straight line use an 'S' pattern so the lures on each side will rise and fall as the boat turns. I personnally recommend the Walker Downriggers which I also use. However I don't like the Walker line 'trips'.