It's up to you if you want to keep the skin on or off on salmon fillets. I prefer to keep the skin on the salmon fillets. If you notice your salmon fillets getting dry through
the cooking process, you can squeeze lemon juice over the salmon fillets. You should season your salmon fillets just before you begin to cook them. Seasoning your salmon fillets
to early can cause them to get dry because salt will draw moisture out of the salmon fillets.
If you want more info on cooking with seafood, you can read my guide here.