I put my salmon in a 1/2 lb. salt / 1 gallon water brine for 1 hour. Then stuff the jars (1/2 or pints) leaving 1/2" head space. My canner calls for 80 minutes at 15 pounds pressure.
I do both skin on and skin off and I don't think it makes much difference as far as oil content or quality of meat. Probably more a matter of preference. If you do leave the skin on be sure and blow off the scales with a garden hose. Otherwise you get a bunch of scales floating around in your fish.
For smoked fish I also only smoke it for 2 hours using 1 pan of chips. Then can it like normal.
Either way it is very tasty.