If you don't have experience I don't recommend messing with your truss rod. I've heard bad stories about broken guitar necks. It's usually a subtle adjustment. Study the subject first.

If the rattling seems to come from the bridge it might be the springs in the tremolo. A trick is to stick rubber bands in them.

If it's actually rattling on the frets itself, you can raise your action. It might be set up for heavier strings. Of course, your string or your fret might also be bent.

Easiest to just take it to a guitar store and have them check it out and set it up for you, until you have time to research guitar setup.

-Carl.