Learn the elements of graphic design

Seven basic graphic design principles by Garr Reynolds
Unity, Gestalt, Space, Color, Dominance, Hierarchy, Balance

Learn the principles of graphic design

The best way to start is understanding the basics. Sounds boring? It doesn't have to be. I gathered some links here to proove that graphic design basics can be realy easy to learn. Drink this, and come back for more!
Digital Web Magazine: The principles of Design by Joshua David McClurg-Genevese 
Balance, Rhythm, Proportion, Dominance and Unity.