Give me ten minutes with you and some semi decent tackle, I’d have you casting reasonably confidently. And that’s the basis of fly fishing.
Sure - there are ways to make it sound intimidatingly tough and complex, but the guys who do that are the same ones who’ll line up to sell you high price books on how to make what’s really a simple thing into - a simple thing. All very profitable.
It is perfectly easy to take your share of trout with half a dozen patterns of flies in several sizes each. A hundred dollars could see you with adequate tackle. Wouldn’t be the best, but you can get top grade tackle bought second hand that only are available because he factory brought out a nrewer one with different colour and maybe decals got changed.
Doing it on a small budget is done by thousands of guys who lack the means for the top models. Which normally are astoundingly similar to the more modest ones.
These days I’d go so far as to say there are no bad rods made any more. A decent line is an investment, but an expensive fly reel is a total waste of money. Fly reels are less functional than in any other kind of western rod fishing, in that they do much less.
Find yourself a pal to guide you through some basics. First times out are best done from a boat because your inexpert casting would get you hung up on herbage behind you if you were on the shore. Getting hung up is dispiriting, might well discourage you before you get a spot of confidence to keep you going.
You’ll make plenty of errors. Read up what you csn, but books can’t replace a patient friend who knows the ropes. I didn’t have this, and as a result came close to giving up a few times when things went badly. But being s fisher already, I was able to draw on other experiences.
Best of luck, and stick with it.
And - learn how to clean and cook your fish. For me, it completes the circle. (I’m now a better fish cook than my womenfolk)
And remember to have fun. Don’t take it too seriously.