I'd say don't buy a guitar right away. Ask around among your friends, I'm sure someone will have an old unused acoustic lying around.. use that. When you get good, you'll have a better idea about the kind of guitar you want to buy. Its also a good way to check if the guitar is your thing (if it isn't, that shiny 300$ Les Paul copy you just bought is going to become the ultimate source of guilt. This has happened to far too many people I know.) Also, its quite likely the old beat up guitar isn't setup perfectly - the upside of this is that its going to help you build calluses like magic.