Whey protein is necessary, especially for breakfast (prevent catabolism) as well as pre and post-workout. Ideally, you would want to take two scoops of WPC/WPI with about 40-80g carbs. Going high/low GI is a preference, but many people will have 1/2-1 cup oatmeal with theior protein, while others will go with dextrose. In other words, yes, whey is a great option. All your other meals shouldf consist of lean proteins and try to avoid 'shakes,' in general.
