Welcome to the board! Your question is very appropriate. You said you have numerous quilts without the final quilting. Are they tops only, are the blocks pieced together? With quilt as you go you piece the blocks, add the batting and backing cut to the size of the block, and quilt that particular block. You do this one block at a time. Then you do the same thing with the sashing. So if your quilts are already pieced tops your best bet would probably be a stitch in the ditch. How old is your machine that you say it's quite primitive. I've known quilters to make complete quilts on their Singer featherweight machines.