You must definitely lay a good foundation first. The foundation is very, very important This is equivalent to whether you can draw. I recommend you to go to a class called COOLACG, majoring in illustration, but in Beijing. If you have the opportunity to go, you can consider it, one-on-one in small classes. The basic course of illustration is also based on illustration, which is completely different from traditional art teaching, and you don't need to learn sketch at all, because the so-called foundation refers to the structure and proportion of human body.