There seems to be no adult calligraphy training class. Very few, if any. Do you have some basic skills? Find someone to introduce you, and learn from a highly respected calligrapher with profound calligraphy attainments. Under the guidance of teachers and your own efforts, if you are savvy and talented in calligraphy, you will improve quickly. A long time ago, I knew a teacher named Li Jianzhou, who taught in Luohe Normal School. He is highly respected and has made great achievements in painting and calligraphy. The actual level has reached the national level. Long time no contact. I wonder how Mr. Wang is now.