Once you've selected your protein powder, you'll want to make sure you're doing everything right to get the most out of it. To recap, ideally you should be consuming a fast acting protein (whey) immediately before and after your workout, as well as a supplement in between meals. To keep your energy levels up, combine this protein with a good source of complex carbohydrates.
Then throughout the rest of the day continue consuming your food and protein supplements at regular intervals. Lastly, take a slow digesting protein (casein) right before you go to bed.
If you follow this simple guideline, your muscles will have everything they need to recovery from your workouts and you'll get the results you're looking for!