If you haven't practiced writing as a child, you'd better start with regular script, such as copybooks and regular script on the computer. Sketch and sketch with a pen, and feel your hands are smooth when you write (that is, you can write casually, but you can't ignore it), and then post a post with the taste of calligraphy. When I was a child, my teacher forced me to practice regular script. I felt very rigid at first, but now I have benefited a lot.
I have no experience in choosing hard-pen copybooks, but you have to read them yourself. Brushes are negotiable. You have to consider your own needs. If you work in an office or other place, you will write more official documents, so choose beautiful copybooks, such as Zhao Mengfu's running script (Xing Xing Poetry is recommended); If writing is not your main job, but you need to write well, for example, if you are a teacher, you can practice Wang Xizhi's running script, such as the preface to the holy teachings; If you are doing something related to art, or want to write the word "handsome", practicality is not the first consideration, then practice cursive. Sun's book spectrum is a good choice; If you usually like to write articles and pursue the charm of literati, then Mi Xiangyang is the best. His "Shu Su Tie" and "Tiaoxi Poetry Tie" are excellent works of literati's running script, and they feel elegant and almost immortal after practice. Dong Qichang is also good, but the book is not strong, and beginners may be stingy. It is best to practice after other people's books have a certain foundation.
In addition, if you are interested, you can also practice seal script and large and small letters. If it's just practicing calligraphy, it's not necessary. Yan Liu can write big characters, but I don't think it is as important as running script for hard pen. Pay attention to the order when practicing calligraphy. It's best to practice all these and lay a good foundation. It takes time.
All these should be practiced slowly, and it is particularly important to be single-minded and not to change jobs, at least until you recite the meeting. It may take ten years or even decades to perfect them, but as long as you write carefully, you will benefit from it and don't have to be fooled by it.