second, you have to download a professional software, which can be like sai or ps, and it supports "painting" and "writing".
This software needs to support downloading from the internet or locally importing "brushes" modulated by others or from scratch. Different brushes have different characteristics. If you want to write brush characters, then.
Painting software recommendation: adobe illustrator draw, needless to say, Adobe has a set of p>Affinity Designer, which has the highest evaluation, but I am useless, because I have graphics tablet's
opinion about how to modulate my own brush from the initial "shape" to "dispersion" to "fuzzy adjustment". You need to figure out the size, hardness and softness by yourself. Please adjust the brush in Baidu ps for details.