There are a ton of videos on how to tie flies on the Internet. As far as supplies go, I recommend you find stuff around the house or buy it ofline. You'll need waxed fly tying string (or whatever its called) dubbing, lead or copper wire, feathers (from a turkey, grouse, quail, geese- more videos for finding what feathers you should use off of these birds.) Deer hair is another very good material to use when tying flies. These are just the basics. Good luck!

Kits are all right but you may find that you'll never use some of the supplies in kits because they're made to cover a little bit of everything. Internet is a great place to start looking for tools and basic materials. For tools you'll need a good vice, thread bobbin ot two, good scissors (sm). Try to get the better quality tools as they'll last forever. For materials, you'll need to decide what kind of flies you'll use most. WET, like streamers, nymphs, wooly buggers, etc. or DRY ie. on top of the surface. In my opinion the wet flies are easier and less exacting to tie. Look around on the net as suggested above, it's loaded with all things "fly". Check back and let us know a little more detail like what kind of fish you're after and what region of the country. Good luck.

I've yacked enough about my point of views on tying...but just a tip that has saved me some money. I've got a box of what was marketed as good scissors that cost say $20, or a little less, or more...a box of them. They go dull, don't fit your fingers right maybe, and you need a pro to sharpen them. About 6-8 yrs. ago I saw a tier using a smaller, pointed pair of FISCARS, not the copy cats, they are worthless. It cost me about $7.95 and I've never regretted it..they stay sharp, and the best yet by far.

Most hospital ERs throw out the little sissors used to cut bandages after one use. Believe it or not it costs more to sterilize them than buy new ones. Man, something is wrong with that picture! Anyway, if you know anyone who is on the inside, have them bag some thrown out sissors. They work great for fly tying. But be sure to sterize them with boiling water.

Three pieces of store bought equipment you absolutely cannot do without: tying vise, bobbin, and whip-finisher. Look on E-Bay for kits. You won't need a real fancy vice. Good luck.

BIOGUY..wow, I think that is a stretch. Road kills, loose feathers, I would never regard as being of any probem. Possession of eagle feathers now could be a problem, but off dead birds? Selling them commercially may be a problem as well.
Problem with collecting feathers is most are worthless, or have very limited use, and skins with feathers can cause bug infestations in your house that ruin clothing as well as other fly tying feather skins you may have paid quite a bit for. I really scrutinize, and limit what I keep any more. Big game skins?..no more. I buy that stuff properly processed and packaged.

Another thought that I have, and my suggestion is...to acquire the materials that you need according to the flies you decide to tie. Why acquire a material when you will never use it to tie a fly, and I have done just that?
But what you learn, is there are good substitute materials that you may have for something you do not have that is listed as used for the fly you want to tie. Why they list some hard to get material, as if it were essential to catching a fish with the fly is beyond me. But you will learn that..do I need this crazy tail fiber they say to use, or do I have a substitute for it that will work just as well?(for example) Some fiber off a critter like Australian possum for instance as if US of A possum doesn't work as well.