One place is the NOAA.gov website for great lakes forecasts. Navigating a boat in the great lakes comes down to a lot of experience and your comfort level. Driving through waves vs trolling is different as well. If they are predicting more than 1-3ft waves i would stay off the lake. even those waves can toss you around and push your boat all over until you are used to it. Trolling with the waves is a good way to go but remember you still need to go against them at some point.