I want to start tying my own flies because everyone I talk to says I should.
I'll be the dissenting opinion. :-D
I think that fly fishing is a great hobby.
I think that tying flies is a great hobby.
I don't think that the two are inextricably linked. In fact, buying flies is kind of a bargain if you value your free time at all. Or for that matter, if you value all the money you will have in partially used materials, etc. A good cape can run $50 or $60 (an excellent one can go quite a bit more) and most of us use just the feathers on it that run from 14 to 18. So you're not going to use more than half the feathers... as a for instance.
I didn't start tying for the first few years of fly fishing because I wanted to concentrate on learning how to cast, reading up on various aspects of the sport etc. When I did start tying, it was because there were some flies I had picked up and had success with that I couldn't find easily or couldn't keep around in sufficient quantity.
When you do start tying, stick to really easy patterns like The Usual, beetles, ants, pheasant tails, comparaduns. Not because it's so hard to do parachutes or quill wing wets, but because those basic patterns catch fish! When I tye a Usual, it takes me half the time it does to do a traditional catskill tye. Guess which pattern I'll throw under a bush, and which one I keep out in the still water! :lol: Well, the trout are all under the branches of the bushes and the hemlocks, so you should have plenty of "junk" flies you don't mind losing to those trees. :lol:
The other bit of advice I'd offer is to get the small packs of sized feathers. They are more expensive, per feather, but you'll use all the material. In the end, I feel like I waste less that way.
One phrase to throw out that you'll hear a lot about is THREAD TENSION. You're first flies will look terrible, but when you learn how hard you can pull on 6/0 thread before it snaps they will improve remarkably.
Good luck whichever way you go! And I hope you keep loving the sport.