My recommendation is to buy materials for 4 or 5 flies that you use most often and start with that. Once you have tied up a few dozen flies, you'll have a pretty good idea if you like it or not, not everyone does. If you stick with it, you'll likely want to upgrade the vise from the one that came with your kit. There are tons of tutorial sites with some great pattern ideas.
http://flyangler.ca/index.php?option=com_f...s&Itemid=42
http://flyangler.ca/index.php?option=com_c...3&Itemid=32
http://flyanglersonline.com/flytying/beginners/
http://www.charliesflyboxinc.com/flybox/index.cfm
http://flytyingforum.com/index.php?act=flyindex
Of course, there is a wealth of knowledge here on the site, and lots of tyer who can help you out.
Some videos
http://copperfly.net/fly_tying_videos.php
http://youtube.com/profile?user=topflyman
When you find yourself walking behind a cute blond and you start thinking about using her hair to tie a fly rather than bounce a dime of her butt, you'll know you're in trouble.