Never fishing a lake before I'd pick up a map and start looking from middle of creeks towards the backs of creek looking for flats with creek channels in 'em. Once on the water I'd hit those places idling around looking for schools of bait on the graph. Usually if there's bait there's fish. If things looks favorable, I'd break out my poles and start longlining. If theyre there and willing to bite I'll catch 'em. If not, I'd check another area.