In a shallow mixing bowl, using fork, combine flour, chili powder, paprika, brown sugar, onion powder, garlic powder, cumin, cayenne, salt and pepper. Heat 2 Tbsp olive oil in a non-stick skillet over medium heat. Baste salmon fillets with 1/2 tsp olive oil on each side and dip salmon into spice mixture and generously coat each side. Place coated salmon in preheated skillet and cook 3-4 minutes per side until outside is lightly blackened and center of fillet is cooked through and opaque. Flake salmon using a fork. Assemble tacos by dividing salmon among tortillas, top with lettuce, corn salsa, cheese, and drizzle with Cilantro Lime Ranch. Serve immediately.