There are several on-line groups that will be helpful to you. I belong to some on Yahoo--the Vintage Singer group and WeFixIt are good ones. If your machine is a treadle, you might want to try
http://www.treadleon.net for good info on getting it up and running. Two other excellent groups are
http://www.ismacs.net and
http://needlebar.org . If you post the serial number of your machine, located at the base of the pillar on the right, on the bed of the machine, I can tell you the approximate date that it was manufactured. With help from these groups, you shouldn't need to take the machine to a dealer to get it sewing for you. The model 15 is one of my favorites for free-motion quilting.
Pat in Rockport, TX