In this youtube the user is using an excarve but the format for the program is the same for the longmill. He shows how to make a simple sign on his machine. You can pause it and rewind as needed if you miss a point. I am going to be seeing about doing a tutorial about this using the longmill and this program later but for now this should help most of you with the basics.
Is this the same Derek that owns MillrightCNC?
He owns an X Carve. Watch the video.