Ink: the quality is better (for example, a German pavilion). Good ink can protect your brush.
Paper: You don't need good paper for this. Ordinary edge paper and meta-book paper are ok.
Inkstone: Beginners, there is no need to buy an inkstone. You can buy a plastic ink cartridge or a small porcelain plate instead.
In addition, buy a painting and calligraphy felt and pad paper for later use. This is a must!
Wish you success!