For women, it is recommended to use less than 5 kg at first, and you can try the following weight yourself.

The method is to find a heavy object and try to bend and stretch the dumbbell arm, that is, hold the dumbbell with your hands at your sides and bend your arm.

If each group has 12, and four groups can be achieved, then the weight is ok. If there are no four groups, then reduce the weight and try again.