Regular script reached an unparalleled peak in the Tang Dynasty (another similar peak was Tang poetry). There were four famous calligraphers in the Tang Dynasty: Ou Yangxun, Yan Zhenqing, Liu Gongquan and Chu Suiliang.
If children prefer Yan Tizi, I recommend Yan Zhenqing's "The Tower of the Lost Treasure" to you.
There are many stone tablets in Yan Zhenqing, and the best one to get started is "Multi-Pagoda", because this model is the work of the author in his forties, which is more standardized and beautiful, and can be understood by beginners. Many pagodas are the first choice for most calligraphers.
However, other authors' essays in their later years, such as Li Yanqin North and Ma Gu Xian Tan Ji, are difficult for beginners and not suitable for beginners.
If you like European characters, I suggest starting with the inscription of Liquan in Jiucheng Palace. Beginners of European physical education are more interested in studying the inscription of Liquan in Jiucheng Palace. If you study European physical education, you can also search and watch Tian's European physical education teaching videos online, which is a good method for beginners without on-site calligraphy teachers. When you get started, you should go back to practice "Jiuchenggong Li Quanming".
Liu Ti is not recommended (unless you like it). It's not that Liu Ti is not good (Liu Ti is also a peak of regular script), but that Liu Ti has a strong personality, which is too difficult for beginners. In contrast, it takes more efforts to write Liu Ti well. In addition, when Liu Ti wrote, there were more Fang Bi, which highlighted the effect of the inscription. Therefore, learning from Liu Ti may not help scholars to transition to running script and cursive script in the future.
The greatest feature of Chu style is rich brushwork and changeable rhyme. Obviously not suitable for beginners, it is recommended to learn regular script after having a certain foundation.