I don't have 5D, but do you not have a stipple design included in the samples supplied. You should be able to bring it up on the screen and select points along the line to move about, even 'select' the design and enlarge it using handles, and then delete the points that fall outside the size you want to end up with. Study the 'help' section, I'm sure there will be something in there. I did find this tute on line, don't know if you have this module but check out doing the stones and pebbles one, it says you use a drawing tablet, but perhaps not necessary. Otherwise, your dealer should be able to help.
http://www.5dlearningcenter.com/Tutorials/5DSketch.htm
I know these programs are hard to learn, you have to use them several times a week to remember anything.