Guitar has a decent learning curve, so dont't be too hard on yourself if you're a beginner. Start small. The D chord. Get ringing out cleanly with no fret buzz.
Then, try the G chord and the C chord. A stretch, but the payoff is rock god beginning!
You Shook Me All Night Long by AC/DC uses these chords in their main riff.
She was a [G] fast machine She kept her [C] motor clean, She was the [D] best damn woman I had [G] ever seen...
TNT uses A, G and D - so get going with an open A, and look up some Chord TABS on the web.