Then, my king, it will be my pleasure to teach you.

[Dismissing the book in his hand, he straightens up, every inch the stern - if fond - teacher.]

The first thing you need to know is the most obvious one. Magic, as humans view it, is just the manipulation of natural energies. Most of it must come from within in these times, as you know. Before magic can be used, you must gain the ability to perceive it. To know your own levels and 'see' them inside of your mind to direct them.