These two workouts are brief, intense, not for people who enter bodybuilding physique competitions, nor for beginners or ponces that spend more time in the mirror posing with their 'mates'.
Along with a decent, sensible diet, these workouts will make you very big and very strong by most standards. I guarantee it.
Eat well, try to get your protein from normal food, not shakes, maybe augment some of your dishes with some protein powder if you struggle. Some recipe ideas
100% is your target weight. When you are able to hit the 100% set, you must increase the weight by as small amount as possible the next workout. If your gym does not have weights smaller than 2.5 kgs, go buy some. By adding small poundages each time, you can keep progressing without stagnating muuuuuuuuuuch longer.