Me personally, I would be staying as mobile as possible, I would pay attention to the areas that get the most of that sunshine, but also have a good look at the windward end if its a fresh wind, going off the weather I would say the bottom third would be a starting point but keep an eye for signs of surface movement has the upper layers warm a little from the sunshine.
As for rigs, I only have 2 for bottom fishing at the minute a simple snowman and a low pop up rig, use would depend on the bottom i am fishing over especially if the lake is heavily tree lined there will be a bit of debris on the bottom now. Never ignore the old zigs (although im still to master the art) if things aren't panning out the way you planned.