In which situations or for what species may some approaches be better than others:
1. spinners vs spoons?
2. Spin n Glow's vs any of the above?
3. corkies and yarn vs any of the above?
4. wet fly vs any of the above?
5. drift fishing vs a stationary bottom rig (ex: bar rig)?
6. drifting under float vs bottom bouncing?
7. lures vs bait?
8. worm (or other live bug) vs salmon eggs?
9. Styrofoam dry fly (with a spinning rod) vs any of the above?
Your questions are too many and too complex.
If you deposit 500 dollars in my checking account, I will answer them for you. Otherwise, sorry, I don't have 10 hours of my life to spare to answer them for you.
Like nickredway said, do a bit of your own research. All those topics have been discussed in detail on this and other forums.
Here's a freebie, to get you started:
Clear and low water, go small. Murkier and higher water, go bigger.
Keep the presentation as close to the bottom as you can without hitting the bottom ( an occasional bump is OK).
You will find that there is no golden rule - that's why it's called fishing, not catching.