This is a tough question because different people use different splits. I would say that the majority of people right now are using a lower carb, higher protein approach, with varying amounts of fats. I put most of the competitors I work with on a split like this:
-proteins: 1.5-2 g protein per lb bodyweight
-carbs: .5-1.0 g carbs per lb
-fats: .25-.5 g fats per lb
This is a generalization, but can give you a base to work with.