I didn't ruin the salmon. Yay! I'm pretty sure this is the first fish I've ever cooked from a real fish counter instead of a box, and it went pretty well for a first try.
I used this grilled salmon marinade from allrecipes.com:
1/3 cup soy sauce
1/3 cup brown sugar
1/3 cup water
1/4 cup vegetable oil
garlic powder to taste
lemon pepper to taste
The recipe said this was the right amount for 1 1/2 pounds of fish and that's more or less what I had. I was supposed to marinate for 2 hours and then grill, but instead I marinated for about 1/2 an hour ('cause I found the recipe right before dinner--way to be prepared) and then wrapped the fish in foils with some marinade poured around them. One piece of salmon (I think it was a salmon steak? I don't know) per foil, baked at 425F for about 15 minutes.
And it tasted pretty good. The kids asked for more, so that's a bonus. I realized as I was eating that if I was cooking the fish in foil I probably didn't need that much oil in the marinade, but it still didn't feel greasy.