Ok, I have my first audition next Wednesday (w00t!

) for a local worship band. I've got 5 songs to learn in the 6 days, so rather than go into detailed tabs for each of the songs I just want to be able to play along.
The guitard (haha, I finally get to say that!

) sent me a few MP3's of songs we're going to play and the chord sheets, at least I think that's what I think they're called.
There are chords over the words in the songs, a section for the verse and chorus. I am assuming that where the chord changes this is where I need to be right? And this is what's referred to as "playing the root notes"?
I'm guessing that I just need to practice and get the timing down. Any tips for getting the most out of these?