I recommend you to buy Wu Hecheng's Bizhuang. Now most people who practice calligraphy know that it is sold in some calligraphy and painting shops, and the price is relatively affordable. For painting Chinese painting, if there are ten to twenty pens (generally speaking) to practice calligraphy, I bought a 20-yuan doubled both brush (recommended at first), and it is not bad to use a little hair, which is recommended by our teacher.
Also, this brand is not available online. I wanted to have a look at it at first, but I couldn't find it for a long time, but it doesn't mean it's not easy to use! Finally, buy a brush and start writing. There are generally introductions on this website, so I won't say more!
Please accept it if you are satisfied ~