Due to the vast amounts of information here at this site, and the fact that Biotest is top of the line, I would try to switch to Biotest's whey protein - 30 bucks, 5lbs, and its for sure high quality.
Due to its speed of digestion, I would take this in the morning, and pre workout. Other times you can use it in conjunction with whole food protein or slower digesting powders for a more comprehensive well rounded protein intake.
Take it after your workout, to replenish what was used during the workout. If you want to do more in addition to that, its fine.
Horrible deal. When this runs out, don't buy it again. Glutamine becomes advisable mainly during periods of extremely low carbs. If you do decide to use it, at least find somewhere to buy a powder. GNC capsules are a horrible, horrible rip off, on the order of 100 or 1000 times more expensive than an equivalent amount of powder (I can't remember, but its ridiculous. I know. I work there.)
Again, just to reiterate, if you have the means to order from this site, I would recommend buying from here. The products are the best and they are priced right.
Like others have mentioned, BCAAs would be more beneficial than glutamine. In addition, you may want to look into Surge for an optimal pre/post workout recovery drink.
What are your goals?