For around $100, you can get a high quality starter outfit from Cabela's, Bass Pro Shops, and others. I have the Hobbs Creek combo in 4wt and 8wt. Both run about $110 each, and they work fine. You don't have to "outgrow" the Hobbs Creek combos; I've been flyfishing 5 yrs and still enjoy using them.
Get a casting video or dvd to help you with your casting. I have downloaded pages of tying knots off the internet as well.
If money is tight, those $20 outfits that Wal-Mart sells will still work. I've used them, and caught plenty of bass and bluegills on them.
Keep your line clean and lubed while casting. Practice your casting as well.