It is suggested that Wu Changshuo's Shi Guwen can be used for reference.
Shi Guwen is a font between Da Zhuan and Xiao Zhuan, which belongs to the transitional period. Fonts are easy to master, while "Shi Guwen Wu Changshuo" is more careful than rubbings, with clear strokes and easy to use.
Brush to see personal writing habits. Generally speaking, two brushes are easier to master. I used double brush calligraphy and Yi Yun Bizhuang No.2 painting.
For your reference ~