As for pens, I suggest a pair of brushes with moderate hardness (don't buy them in stationery stores, where stationery is generally not good, it's best to buy them in a Four Treasures of the Study store). For beginners, if your skills are getting better and better, you can use a pen according to the fonts of famous artists you imitate without making specific requirements.
For paper, I suggest using edge paper. You can buy it at the stationery store on one side.
Beginners of calligraphy must first learn to imitate, imitate famous artists and imitate strokes thoroughly. Then learn the structure of Chinese characters. These two steps are the most basic and critical.