Yeah, there's not much to do but foot it the old fashioned way with pencil and paper.
If you're like one foot stepped into drawing, Paint Tool SAI is a very decent, cheap, and fairly intuitive program that was created purely for artists to do CG. Be forewarned though, if you're looking to get into CGing things on the computer, you'll probably end up investing in a tablet at some point.
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: Lenini Leni (Hyperion), Mumukyu Mukyu (Excalibur)