Graphics is one of the easiest things to learn, the hard part comes when you are to make something that noone ever sees before...
Its ok to study the basics of graphics online or if you've got time in your hands you could use the easy way of just going to school. If you haven't got the time then online tutorials ar the books u'll only need.
first thing you must know is what programm are you planning to use? their are many programms out there with different tools but they can all be used to provide the same results...
**** now take your pic and lets work together on the attached picture ***
I have attached a picture below if you can make somethin out of it then anyone is welcome to post...