When I was doing my first one I found this on youtube. It was really helpful.
Double Wedding Ring part 1 quilt video by Shar Jorgenson https://www.youtube.com/watch?v=eQPmfGp8wmQ
Double Wedding Ring part 2 quilt video by Shar Jorgenson
https://www.youtube.com/watch?v=UJXqIILJ550
Part 2 is probably the one you need for the final assembly. It's a long video but a wealth of information.