It is key to know where and when they spawn, and then you can put the pieces together. Where I fish opening day is usually 2 weeks after they spawn, so it's perfect. I look for the best structure tight to the shorelines near the spawning grounds, they usually hug the shoreline for the fist few weeks after they spawn, my favourite technique is casting jigs and slowly hopping them along the bottom, don't overlook any docks or boathouses along the shore. If you don't know the area to well, I would drift worm-harnesses with minnows along the shore until you find them.