Excellent decision, Dankay123

I'd echo the advice here and buy the exact tools and materials you need, rather than buying a kit.
I'd recommend a ceramic bobbin holder. They're a bit pricey but will last years upon years. Non-ceramic ones will get grooved and eventually cut thread.
Dries:
A genetic cock neck or saddle would be beneficial. Grizzle is probably the most useful colour. Necks will tie a greater size ranges but the trade-off is that you get fewer hackles per-size.
Some CDC is a great idea for dry flies too.
Poly-yarn for parachute-posts.
You might want some micro-fibbets or coq de leon feathers for tails on your upwing dry flies.
Spiders:
Game-bird feathers and perhaps some Pearsall's tying silk if you want to do them "by the book". maybe some hen-hackles.
Nymphs:
Pheasant Tail, Hare's fur (probably from the hare's ear).
metal beads. Shell-back for czec-nymphs.
General Materials:
Almost all tyers will have peacock herl and copper wire,
some dubbing (olive, grey, rust, black) (make sure it's not water-absorbant if you're using it for dries), dubbing wax.
Hooks:
heavy hooks, light hooks, curved hooks.
Vice:
Vices are often very expensive, but I use a Thompson Model A and find it perfect. It costs about a tenth of a top-end vice but it works brilliantly.
Anyway that's based on my own tying. You'll quickly know yourself what you need and don't need.
You will probably find that you break thread when you start. I remember using 8/0 thread and breaking it like it was cotton wool. Now if I use 17/0 (probably the lightest thread there is), I never break it. So remember that the amount of tension you naturally want to put on the thread is probably too much. The gel-spun threads like Roman Moser Powersilk are very strong but they are slippy, which is a drawback.
Here are some places you might look for materials:
Fly-tying materials and fly tying tools and accessories - Lakeland Fly-Tying
Cookshill Fly Tying Materials (has a great reputation for natural materials)
FlyTek Fly Fishing, Yorkshire, fly tying materials, fly fishing equipment.
Fly Tying Materials, Fly Tying Equipment, Fly Fishing, Fly Tying – Fly Tying Boutique
Sportfish - Fly Fishing Tackle and Fly Fishing Equipment
http://www.fishingmegastore.com
All Fishing Tackle | Fly Fishing Rods | Coarse Fishing Gear
Fly Fishing Tackle, Country Clothing & Fishing Equipment Shop
Farlows
All the best with the tying! let us know how you get on!