Where they are in the water will depend on the water temp of the lake. If the shallows are warmed up over around 60 they will likely have moved a little deeper. Trout are not warm water fish. Chumming is fine but I would start with spinners or dry flies in the shallows first in the morning and move deeper as the day progresses or if nothing is biting. I have seen some light mayflies and caddis recently so I would assume, like the stream by me is currently, white or a similar light color would work well. If you are dropping down to deeper water a piece of crawler, small twister tail, or even a smaller stickbait would work.