Starting off, I wouldn't buy anything overly expensive. I learned how to play on a guitar I found unprotected in my parents' closet. It had a hole in the soundbox and was missing a third of the bridge (on the B and high E strings). It also helps you greatly appreciate the better guitar when you're ready for it.
I taught myself to play while I was at ISU, so I know what you're thinking. Start off by learning A, Am, C, D, E, Em, and G, and you will be able to play about 75% of songs out there. Next learn the bar chords that are based off the "A" and "E" shapes. That will cover the B and F chords, as well as all of the sharps and flats of the other chords.
Ok, so that stuff all sounded foreign to me. Is there a guitar for dumbies? =)