It is better for teenagers to learn calligraphy for the first time.

Just sign up for class, because there is a teacher to teach! However, I personally think that if you can learn calligraphy, you can learn the basics in the last class, so that you can get started faster. But if you really need to grow up, you still need to hone yourself and spend time on calligraphy practice and research. "Daily Practice" has some calligraphy practice tutorials. The copybook is very good. You can practice while learning. Even if you sign up for the training class, you can use other brushes or something, which is more professional.