Dispy Diver set-up
You can run a spoon, j plug, flasher/fly it doesnt matter. If your just starting out keep the length of line from the dipsey to your lure shorter than your rod lenght or it will be tough to land fish and also harder to set lines with say 15 feet of stuff behind the dipsey.
If you are going to run 4 divers and have not bought all your gear yet I would recommend 2 longer rods like 9 footers and 2 shorter rods like 7.5s. Put the shorter rods closest to the back of the boat and run them totally parrallel to the water on a setting like 1.5 or 2.
About a foot ahead towards the front of your boat run the 9 foot rods with the tips up just a bit higher than your other 2 rods and put those on a 3 setting.
Your looking to get the back 2 down deep and keep them tighter to the boat, and the front 2 to run outside of them and probably a little higher.
I ran 4 dipseys for awhile and it can certainly work and work smoothly with the correct spread and setup.
I would NOt recommend putting 4 flashers out especially when your starting. Go one flasher a side until you are confident in where everything is running.