The 10kg dumbbells are for people who have a little bit of experience and a basic understanding of weight training. Although it is still in the beginner-level weight category, you need a little muscle to start at this weight.
In short, yes. In order to gain muscle, you need to ensure that you are overloading your workouts incrementally and that you are in a caloric surplus. Caloric surplus means that you are burning fewer calories than you consume, which is essential for increasing body mass. i.e. muscles