Drawing comics is fun, but it’s also a lot of work. Figure drawing, being able to construct objects and environments from your imagination, and having a true understanding of perspective all take time. You have to dedicate hours and hours to active learning.
In my experience, the key to success is setting small goals and pursuing them relentlessly. When you master one goal, name a new one and get started. If you take this approach, the day will come—sooner than you think—when you have more abilities in your possession than you have left to master. When you master all the necessary skills, creating comic art feels much more like play than work.
Make drawing a daily practice. You will become better, and faster if you devote an hour a day, every day, to drawing. The better you get, the more fun drawing becomes. You’ll find that the hours fly by while you create worlds that only exist in your imagination.
Enjoy!