Belief in magic, Willing, strength, and Knowledge.
These are the first things you'll need to do magic.
Then later you'll want to learn your elements, remember there are 5 elements;
Fire, Wind, Lightning, Water, and Earth.
its best to concentrate/meditate near each element to find yours, also remember you can have 2, but some people only have 1.
If you need any help with protection symbols, just look at my pictures on my profile, they'll help with alot of things.
If theres anything else you want to know, simply message me.