It's important to develop your abilities. But there's no sense in developing them unless you also put them to use. Get ready. Prepare. Become competent. And then be sure to make something of it.
You must not only ask, "what do I need?" You must also ask, "what will I do with it?" It is easy to get sidetracked into developing more and more capabilities, until they are far beyond what is necessary to get the job done.
Excellence comes from preparation, yet the excellence is not in the preparation alone. It is nothing without the performance. Learn and rehearse your lines, then walk on stage to face the audience. Train and practice, then step onto the competitive field of play. Write, revise, and edit, then publish your work for the world to see.
Prepare with diligence, and then do the thing you've prepared so well to do.