Hi RT: At the risk of being presumptuous it strikes me that most of the books I have read on anadromous sport fishing try to appeal to both the rank beginner and the serious fisherman and do justice to neither.
We know that 10 percent of the fishermen catch 90 percent of the steelhead which means that there is a vast audience who have fished 4 or 5 years and are serious about improving their catch rate.
It is this audience i suggest you might write for. They already have most of the gear they need,they hopefully have consentrated on two or three lures exclusively and know them pretty well; their big problem is finding fish .They lack the tricks of where and how to look for them,they expect to see whole fish when they should be looking for parts of fish. They waste time on fishing trips when the river isent right.They dont know the weather sequences which bring fresh fish into the river.
They dont know watermanship and they cant visualize how their lure is behaving when its invisable at depth.
They cant manipulate the lure so that it fishes properly.
I may be way off the beam but I think if you can answer these and similar questions in depth you will make an outstanding contribution to the sport fishing literature.
Best of luck
Coot