If I start on the edge, I start stitching on the wadding part and don't do anything else to it as it will be cut off and buried in the binding. If I start elsewhere, I bring up the bobbin thread and leave long ends to knot and bury in a similar way to hand quilting.
Some people stitch very small stitches in the same spot for about 4 or 5 stitches and then clip the long threads off. I don't like this look. I don't want my stops and starts to be detected.