To build lean muscle, one should make sure that you are getting roughly 1 gram of protein per pound of target body weight, with the protein spread throughout the day, ideally into at least 5 meals / snacks. The ideal protein for post-workout is a whey isolate because of its fast absorption time. Pre-workout, you should have a protein with a long enough digestion time to account for the period between when you eat the protein and when you finish your workout.

If you choose high quality proteins, there should be minimal fat and sugars to worry about burning off.