It's an enjoyable pass time and very pleasing when a fish wallops a fly you made yourself. You can go as expensive or as economical as you want. There's a lady on the net that makes excellent hand-tied flies and they are really hand-tied. She doesn't use a vise or other equipment.

I get a lot of my rubber, feathers, beads, etc. at craft stores for a lot less than you'd pay at a fly shop.

There are hundreds of fly tying sites on the web that give excellent instruction as well as you tube videos on tying. Hatches Magazine and others have good libraries on individual flies and how to tie. If you like fly fishing, you'll most likely lite the tying too.