Yep, you pretty much got it.
Find warmer water, cover the north shorlines, look for shallow, dark bottoms. If you get one, stick to that area, there will be more. They could all be in a very small area though, so make sure you don't miss anything. I've caught hundreds of crappies out of an area no bigger than 10x10. If I had of missed taking a cast there, i probably would have been skunked!
I like 2" grubs, tubes, and finesse minnows under a float.
S.