Practice regular script first (beginners recommend Ou Yangxun's "Jiuchenggong Li Quanming" or Liu Gongquan's "Mysterious Tower Monument").
Practice the official script again (I recommend Lu Dingshan's Introduction to Official Script copybook, which is not an ancient text, but I think this copybook is more helpful to beginners than Gu Tie. Don't copy Cao Quanbei in a hurry, it won't suit you).
Then the running script. At the beginning of the running script, don't look for ancient iron exercises such as Preface to Lanting for the time being. You still don't understand. Beginners often think the Preface to Lanting (the best running book in the world) is not so good! When you think the Preface to Lanting is really beautiful, copy it. Why? Because the essence of calligraphy is ultimately to give people artistic beauty! So are other ancient posts. Just be happy. If you are not interested in practicing, it is no use forcing you to write with a knife. The key is personal hobbies.
The cursive script is the last one, so it's not that far. It has to be written for more than ten years.
You can practice Oracle Bone Inscriptions if you like.
Practice pen:
Similar to a soft pen, but there is no need to write official script at the beginning, and the order is regular script-running script-cursive script.
Recommend a few copybooks: Pang Zhonghua in regular script (choose a copybook of poems and songs, and practice calligraphy correctly). Pang Zhonghua's regular script is very helpful for homework. Running script "Pen Calligraphy Running Script Course" was written by Li Fangming. His running script is very distinctive, and you can easily grasp its essence. You can buy physical copybooks to practice official script and seal script.
Finally, practicing calligraphy has a lot to do with personal temperament. If you can't write well in haste, don't rush for success. Let nature take its course and your handwriting will progress unconsciously.
FYI