Welcome to our fellowship. I believe you will find that this is a very good place to be, with some very great people here.
With all due respect to the author of your fly tying book, the pictured fly is not a nympth. It is called a Soft-Hackle fly. One of the sure give-a-way signs is the use of Hungarian Partridge for the hackle. It is one of the distinguishing features of this type of fly. In fact, I believe that pattern is simply the Hungarian Green, sans gold ribbing. Most Soft-Hackle patterns are basically just a body, and hackle. It has none of the parts of a true nympth pattern.
The closest thing to an all-around nympth pattern is either the Hare's Ear, or Pheasant Tail nympths. Nympth flies have a tail, a segmented abdomen section, a well defined thorax section, covered by a wing case, and with a 'beard' in front. These are the defining characteristics of nympth flies.
The 'Begginers' section of this website has the best instructions you will ever come across. You are definitly in the right place to learn to tie flies correctly. And if you need help with them, you can pretty much get help 24/7 here on the forums.
Happy tying!
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