Like everybody else says start with a 5/6 weight 8.5 or 9' combo. These usually come prespooled with floating line, generally weight forward (WF) not just from Scientific Angler, but also from Cortland and for a rockbottom price for the most basic equipment also from Martin. You may also encounter Pfeuger or Shakespeare combos. All of them are better than the solid glass jobbie I started out with. Nearly any fishing shop will have one or more of those, and many of the larger big box sports outlets, such as Dicks, Cabelas, Gander Mountain, you name it (I have even seen them in KMart) and a whole lot of online sources, also do. Start with the little poppers, lots of folks who panfish with fly equipment end up using nothing else.
Besides learning the basic backcast technique also learn to roll cast. You may find yourself doing more of that anyway, if you fish where there is no space to backcast. If you can roll you can work around trees and in pubic parks where backcasts can interfere with other recreations. It is amazing how well and far you can reposition your presentation with a good quick roll and never have to worry about what is behind you.
You can get the basics first for cheap, and find out if you really like it. You never really have to upgrade to the real expensive equipment either, unless you are one of these guys that likes to show off the brand names or you end up becoming the next Lefty Kreh.