Howdy Robert,
Rhea Topping's book "Rod Rage" is about ethics and a great read. She talked to many guides and whos who to compile the book,

There are several I like
Up stream angler has the right of way.
Angler with a fish on has the right of way.
Give the Wader some room.
Ask before casting to a pool or run of the angler that is there first He has the rights to the pool.
Do on to others as you would have them do on to you.
Leash that dog, Quite the kids or the otherway around.
One more I saw I liked
Fish don't live in ugly places Don't make it that way.
ol Al

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Ol' Flysoup
Flycasting is as easy as flysoup