Wayne,
The following is link to LJ dodger technical info that should answere most of your questions. http://www.luhrjensen.com/techreports/13DodgersFlashers.pdf
Gus
The end with the snap swivel is where you tie your flie or lure on too.. or smelt.. depending.. You can run short leaders.. 10-12 inch or longer leaders.. 18-24 inchs.. depending on your trolling speed and your desired bait.. There are lots of ways to rig them.. I like them with a Pauls Bait Rig and a dead smelt.. works great..
Jay