For someone looking to learn some of the more text book stuff in regards to salmon fishing (i.e. tying knots for leader, hooks, leader-to-leader, casting technique, etc) check out Youtube. This is an amazing how-to resouce;I have used it for everything. I use it more when I want to practice stuff before the season or inbetween fishing trips. I learned how to ty tappered leader; different knots; casting technique; how to find where trout lay in the seam; and tons more. I know your not out on the water, but if your home baby siting, or at work fiddling your thumbs you may as well be learning about fishing. Just makes sense to me.
My last tip is to never give up...because as I am still learning myself, fly fishing is truly an art. Don't get too frustrated when you see someone that can throw a line 4 times as long and straight as yours. It took them years to perfect that skill.
And like someone else said, get out and on the water, because no matter how much youtube you watch, it will never hook a salmon for you.
My two pennies worth,