There are a lot of potential causes for a buzz or rattle, and almost all of them are in some way related to your guitar's setup.
Did you attempt to adjust the neck or bridge? Although these procedures aren't overly difficult, they do take a bit of practice to get right, and are easy for a beginner to screw up. The good news is that barring catastrophic ineptitude, any problems caused by improper setup are easy to fix.
If you want a conclusive diagnosis, you'll need to take the guitar to a qualified tech or luthier. It's a good idea for all guitarists of any skill level to find a competent tech; not only can he (or she!) take care of things like neck/bridge/nut adjustments, he can also provide advice and insight towards your instrument.
Get thee to a shop. Have it looked at. It won't cost much, even.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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