Learning a lake is tough work! Get notes and screen shots as you learn the lake. As many ppl said focus on wind blown areas. Wind stacks up plankton which stacks up shad which stacks up game fish. Focus on wind blown contour changes such as banks, points, humps, islands, steep banks. Don’t fish unless you see hybrids on sonar. Check out my YouTube channel “RespectTheFish” for several examples and guidance to reading sonar. If you don’t have a “smart” trolling motor that can spot lock you over fish to present live shad or own downriggers, then I would consider trolling crank-baits. My best advice with trolling is to focus shallow like ontop of humps and points as the shallower fish seem to be more aggressive and likely to bite artificial baits while the fish hanging deeper on a point seem to ignore artificial baits and only bite live shad. Hope that gives you a start.
RespectTheFish on YouTube