In one story that I've come up with, there is an academy (or not. I'm still working that out) set up in different areas of the world where one can learn to use the elements of the world. Think of it as something similar to Hogwarts. You choose the elements that you want to learn; you can pick one or you can go the whole 5 miles and pick every element. The elements of choice are: fire, water, earth, wind, and lightning. The school is operated based on a rank system: you attend class and train, then, once you feel ready, you apply to move forward to your next rank. If you fail, then you have to try again later. As you move higher in rank, your lessons become more in-depth; for example, for a fire-user, the first rank would teach them how to conjure fire, while, in the 3rd or 4th rank, you'd learn how to "fire" that fire. At the 3rd rank or higher, the school allows you to take up jobs/assignments and use your power outside. There are other achievements, but I'll tell you on another day.