You keep hearing about brushes....try adding a brush, or where did you find that brush, etc..............what the heck is a brush? It's kind of hard to explain actually. So I thought a little tutorial with pictures on how to use them would be the best way to explain brushes.
This tutorial was made using Photoshop Elements 3.0, but I think it will be helpful no matter what graphics program you are using.
Beginner Brushes Tutorial