There is a cabellas in Reno. It probably also has free fly tying classes. They may not start until fall though.
When I got started 10 years ag0 these two books helped alot. They both covered a lot of the same thing but both also had some good details about hooks and feathers that the other one did not.
Universal Fly Tying Guide by Dick Stewart
Fly Tying Made Clear and Simple by Skip Morris
They both probably can be had used from amazon for not much money I bet since they have beeen around for a long time. I still see them both in fly shops sometimes.
Now here is a book that I am sure would be well worth the money.
Charlie Craven's Basic Fly Tying. I ahve several friends that swear by Charlies methods and capability to teach. They have taken several of Charlies fly tying classes. One of them is a profession fly tier that ties flies for Charlie's Shop.
If you got some time on your hands what would also help a lot is if you were to look up some of the most common fly tutorials on Charlie Craven's website. His tutorials are the best on the web. Very detailed showing every single step one goes through. Many times he explains why it is important to do it in the manor that he does them. Generally the common flies that are taught to beginners by most people are the ones that also he uses to explain the most important aspects of tying flies. So it would be helpful for you to choice some flies for you nephew to study and tie. Telling him in what order to tye them.
Charlies website.
www.charliesflyboxinc.com. click on "FlyBox" Select a fly from the drop down menu box. Click the "Get Pattern" radio button. The fly and discriptions and recipe will appear. But if you look near the top right you will see "Click Here For Tutorial" in red. Click it and then wait for the step by step tutorial expode out. It may take a while if you have an older computer.