Quoting Alessandro Mattoncino
What software did you use to make the instructions?
I use the Ldraw tools. http://www.ldraw.org
"LDraw™ is an open standard for LEGO CAD programs that allow the user to create virtual LEGO models and scenes. You can use it to document models you have physically built, create building instructions just like LEGO, render 3D photo realistic images of your virtual models and even make animations."