The important thing here is to start doing something. The more you create, the more you can create. When the flow of producing content begins, more creative content ideas will come to your mind. If you want to produce content, you should start producing as soon as possible. It doesn't matter at first how good it is. It is important to learn how to do this job and to improve yourself in this regard.
You will also start getting feedback when you start producing content. Maybe you will gain followers. So they will tell you what they want to see. That's why starting to produce content is the most important step.