http://www.4dquiltdesign.com/insp_quilting1.htm
I have the 4d quilt design software that I use with my QBOT. I think it will output a format your SS will use, you would need to check. I like it fine, but haven't used it much. I am familiar with vector based drawing applications like Adobe Illustrator and Corel Draw, so it was an easy transition. There is info on their site and also on YouTube.
I bought my LA setup used and the software was included.