[xjsb125]

Start with your audio. You can either select what you feel is the best source, and make any necessary adjustments to it, or you can create a matrix from the available sources. If you create a matrix, don't just throw them all together. Pick which ones have the best high frequencies, and which have the best low frequencies. Once you have your mix ready, you can drop it in your timeline on FCP.

Now you can add your video. Make sure you line up the video so it is in sync with the audio. More than likely it will fall out of sync with the audio at some point. You will need to time stretch/compress the video to sync with your audio source. The best way to do this is to compare the camera audio with your source. Match up peaks in the audio, such as the first cymbal crash, or first vocal; repeat at the end of the video. When you begin editing your video, avoid cheesy crossfades from one track to the other. Make straight cuts, but place them where they make sense, and don't jump back and forth too much. Each video will likely have flaws, such as shaking, panning away from the band, focus, etc. Try to hide those flaws with your edits. Just some things to think about starting off. A lot of the other folks on here will have some other views and great suggestions. If you get stumped, just ask!