"Six of one, half a dozen of the other" meaning, whatever you are discussing is the same.
"Dark thirty" meaning thirty minutes after dark.
"I feel like I have been rode hard and put up wet", meaning you have sore muscles after working hard.
"I've known people sicker than this, but they were in the grave yard", when you felt really, really, bad.
"If you are gonna dance, you gotta pay the fiddler", self explanatory I think.