What copybook should I choose for the first exercise?

Generally speaking,

When practicing Chinese characters for the first time, we should choose regular script copybook, because regular script is the writing of Chinese characters in the stages of origin, development and evolution, which embodies the most basic characteristics of Chinese characters and is a typical example recognized by China people in terms of practicality and artistry. In terms of font structure, such as point, horizontal, vertical, left, press, pick, hook and horizontal, strokes, strokes and strokes of Chinese characters are all prepared. Therefore, if you master the writing method of regular script and practice other characters, you will have a foundation and it will be logical.

Of course, people who are interested in the art of calligraphy can practice from official script, seal script, even from bronze inscriptions and Shi Guwen, that is, from the source of Chinese characters, and grasp its regular characteristics, which is also a good choice.