A few random thoughts …
As I said before, I’ve never been very impressed with that book. I’m obviously in the minority, though.
I like fly fishing, but I catch FAR more fish on spinning tackle. I use three methods for gills:
1) Float fishing with maggots
2) Casting light jigs (usually tipped with bait)
3) Fly fishing
In terms of fish caught, fly fishing is not even close to #1 and #2, but fly casting is fun and topwater strikes are great. FF really shines in shallow water. I don’t do it if the fish are deeper than 5’.
If you like to read, check out a book called Piscatorial Absurdities by Joel Robinson. Robinson was a die-hard fly guy and then “rediscovered” UL spin gear. Now, that’s about all he uses. I have the book and it’s excellent. It’s much better than the Wilson book, IMO. He spends a whole chapter comparing FF with UL spinning. If you’re interested, here’s more info: Home - Piscatorial Absurdities
There’s a ton of hype about fly fishing and some people make it far too complex. I’d suggest buying a simple outfit and trying it out. Get something like the Scientific Anglers Panfish combo. It comes with everything you need, and it’s less than $100. Then, go after them in the spring when the fish are shallow. Use some some small poppers, woolly buggers and nymphs. You will catch fish.
If you have any specific questions, post them here or in the FF forum.