Well I was just up and bought some materials for a new fly I am thinking of. Prices raised about a dollar on the 50 packs of mustards at 7.99$ for 50

Thats pretty good. Everything i see online is for a 20 pack for a dollar or two less.

I think our sponsor here has the mustads co68 for $3.45 for 25 and the 3906b for $5.25  for 50.  Both good prices and with a $30 order free shipping. The 37132 is a little harder to find online. It is very similar to the 68 hook and I find myself using it alot.

Does a size 12 fly, for example, mean its always made with a 12 hook?

Yep.
 

There  was a day I stole the last royal coachman from lucky's box.
It was let's say THR FREAKING HOT FLY on a day that people told us we hooked at least 100 steelbows while others around had hoked a handful.
It was tied on a size 2 hook low water style making it look like about a size 6.
Instant hookup and when I landed it the hook circle the whole jawbone.
Best hook hold I have ever scene.
I still feel bad for taking it from his box.
 
 
 
 
 
 
 
 
 
 
 
 
NOT!

dtrobe
Does a size 12 fly, for example, mean its always made with a 12 hook?

What does vary is the hook strength via wire size- 2x is stronger than 1x and what I use for salmon along with 3x strong nymph hooks, shank length- 1x long  is generally an egg hook or can be used for one- 4x are long shanks for streamer type flies.
You can land a salmon with lighter wire hooks, but you have to hope the hook is buried completely to the bend, otherwise they tend to straighten. Longer shanks tend to get more torqued- that's why the heavy salmon hooks for your classic streamers.
Oh yeah, Mustads for me, or Orvis hooks as I live near the Flagship store. Their hooks are  a little more, but chemically sharpened and of very good quality- they re-label Daiichis .  I use Gamagatsu Octopus hooks on articulated and tube flies.  - generally 4's.  Like Lucky said, they are dangerously sharp- swinging flies I generally don't hit the bottom, so don't have to worry about the somewhat fragile points. Mustads are the most durable points, I've found.
 
 

Since a tackle post is up what advice can you guys give me on spinning tackle to use up there?
I don't fly fish and will be making a trip there in a few weeks. I do steelhead in PA so I do have that set up.
What I looking for is lb. test, reel capacity do I need large for the salmon, leader, bait and or lures?
Thanks in advance.

8-15 #test will get the job done.
Heavier lands more but hooks less fairly.
Lighter gets more true takers but is tougher to land them, quicker is better unless you intend to keep the fish.
Most will use a rod 9 foot or more capable of handling line in that range.
If the reel has a decent drag and can hold 100 yard of your line of choice it will do.
If the fish is anywhere near that far away its time to point your tip at it and snap it off or turn it around.
 
Eggs, glo bugs, beads, flies all will work.
 

Always felt that 14 lb test was fine for Kings-especially in fast waters and especially for anyone who is 'new' to Kings- they are brutes when they want to be. That's what I keep on my spin stuff for guests.
 For Steel later on with the noodle one can go much lighter- and expect breakoffs for the late King or two.
 Hey--- one thing guys never mention when talking line size is how willing or able you are to run up, down and across the river chasing a King. The older one gets is often the key ingredient to that. Light line often means a marathon of tripping over rocks and saying 'oh well- been over the waders before ' when getting to deep pockets trying to keep one on- lol.
 Good luck- your in for  treat.