Been fly tying for about 5 years now, and I tie more dries and wets than others. As Skip said you start tying flies and also jigs you're going to be spending ALOT of money!!!! If you really want to try a bunch of different stuff get on some fly boards like FAOL, Fly tyer forums and FlyTyer. They have a material swap box every now and then and believe me there are some serious materials in there!!!!!!!

Here's a my dry and wet box's

Dries
Front half of Dry Box -
Back half -

Wets