Water temp varies on other factors and what the main lake is, but I would say the mid 40 degree range is when they move in.
Natural baits I don't know, I don't use live bait for them I don't want to risk hooking one too deep and killing it. The resource is very fragile. It is a big lake, but only so many places for bass to spawn and live means it is a fragile fishery, especially in the spring.
Artificial baits, plastics, cranks, jerkbaits, spinnerbaits all have their time and place from the shore, though it is usually hard to beat a finesse plastic such as tubes or dropshots
Best time of the day is early morning or evening
Use light line (6-10 pound test, max)
Take care of this great resource. Release these fish carefully.
Have fun catching them, but treat them carefully. Don't lay them down on concrete or have them out of the water for too long, especially now when they are prespawn. These fish need to be carefully released to help ensure we preserve them for the future.
Shore fishing in the spring can be as productive as fishing from a boat if you get onto a group of fish in the right place.
There are state records swimming around out there, go catch one.