You don't have to sign up for classes, but you should learn relevant knowledge, online resources, book introductions, or ask people around you through some channels. There will be many problems in the early stage of learning, such as the way of writing, the posture of writing, the way of writing and so on.
As the saying goes, a master leads the practice personally. Once he has mastered the basic knowledge, he has to practice for a long time to write well.