As with any creative endeavour, a designer's process is an important factor in producing great work. It's often helpful or at least insightful to get a peek at other creative practictioners' workflows, so I thought I'd share mine.
Step One: Sketching
Even if you design primarily in the digital realm, working with pencil and paper is still an invaluable excercise. I have a sketchbook that I am constantly filling with all my thoughts. It never leaves my side!
Personally, I find that developing your sketching skills is a fantastic way to flesh out ideas before moving them to a screen.
Step Two: Move to digital
At this point in the design process I usually say "fuck it" and just do the whole thing from scratch in Illustrator.