Mmmm...salmon! I just love it and find it very easy to cook. I usually bake or broil mine. It all depends on the thickness. If I'm baking it with a little sauce (honey mustard is so easy and delicious) then I know I have a little more room for error since it won't dry out as much. I think I bake it for about 20 minutes (but, like I said, it depends on the thickness). Does your recipe have a guideline? If not, just google it for some idea of cooking time.
When I broil my thinner pieces, it's 17 minutes at most or it's too dry. When I do that I just spray a little Pam on it and then sprinkle on some garlic salt and paprika. Simple but good.
To answer your question, when it's cooked, the colour will noticeably change to a lighter pink and it will be really flakey. If you're unsure you can check it at the minimum time by cutting into the thickest part. You will absolutely see a colour difference in the middle if it's not cooked through.
Just my opinion but with salmon you don't have to worry the same as with chicken, it can be served on the rarer side, I just don't like it that way.
Good luck...I hope you love it!
