Here are two videos that I found helpful this first one is about joining your ends when you had done attaching your binding to the quilt and the second one is doing the mitered corners...First video...Second video
The pictures below is to show how to join your strips to make one long binding strip. The first picture shows you where to stitch when you put the second strip RST (right side together) on top of the first strip. I show the stitching in blue so that it can been seen. The second photo shows how it should look once pressed and open. After that you can trim off 1/4" away from the stitch line. Make sure its how you want it before you cut.