Everything that goes into your system is counted be it protein, fats, carbs and calories from them.
All protein drinks have some carbs,just depends on your needs and the brand.
I agree it's best to space meals every three hours if you can but I also find it easy to get an extra drink in an hour after or before a meal.
I suggest taking 1/6th of your daily protein after training if your eating 6 times a day.If I'm taking 300 g's of protein per day I do 50,don't worry about the fat.As NOTD said carbs are important then again depends on your daily target.I do however suggest Twin Peaks Carb cycling if you want to control body fat.It's your call.
I also include Glutamine and some like Creatine post cardio.