Start with the most basic strokes. In the meantime, you can make some simple words at home that contain these strokes. (For example: dot, horizontal and vertical form a "下"; horizontal fold - "日") Then, you can choose a post according to your personal preference or style (it is recommended to choose famous writers from the Tang Dynasty, the Tang Dynasty was the most prosperous place in regular script. period). Then you can write a couplet, starting with two words. Then you can write some poetry. If you are interested, you can learn other fonts.
Recommendation: Find a teacher and take classes!