You can find whey protein that doesn't have a lot of calories or fat and tastes good. I don't shop at GNC, so I don't know what they have, but I'm sure they have stuff. Just look at the labels. But you might want to search the forum here first, there have been a lot of threads on PP. I have some I like a lot just with water, so for 160 calories and virtually no carbs or fat I get 34 grams of protein. For post-workout, I blend it with frozen fruit to get the carbs and protein combo.
When I was new to NROLFW, I did HIIT about three times a week, and lost a lot of fat. I'd do it on the days I didn't lift. Read again what the book says about doing HIIT: 15-20 minutes of it, then get off the machine, stop entirely for 5 minutes, then get back on and do steady state for as long as you want. It gave me a ton of energy doing it that way, and like I said, the fat came off. I mostly did it on the elliptical machine, then I started doing sprints on the treadmill, but you can use any machine or even run outside, or do stuff like jumprope or jumping jacks or really anything that requires that level of energy.
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