I'm not sure I completely understand the question, but I can say that startig to consume whey is something you can do at any time. As for the time of day, it is best before and after a workout. Whey isolate has the most protein but can mean that the whey has been robbed of it's other health benefits, making whey concentrate the most favorable. Some ppl have bloating with whey concentrate though and that could be a problem. If this is the case then that means it wouldn't do harm to take whey isolate because you can always get BCAAs from food, especially eggs which are the best protein around as far as percentage of absorption goes.