I don't shoot weddings, I haven't had the chance (I'm only a kid).
Don't do it, it's a miserable job.
Seriously, shooting weddings wouldn't be bad if it where only the bride and groom, that part I quite enjoy actually, they are always willing and easy to pose, plus happy people are always more photogenic, and who's more happy then the bride and groom. It's when you get to the group photos of the whole extended family that it sucks, and people have big families around here. After spending 10 minutes yelling and gesturing to get everyone in the right spot, and looking forward, there is always some aunt or mom or grandma that gets all upset because a toddler is crying, or little Billy or Suzy has there finger up their nose, or a frown during the group photo. Then they always come to me and say, "You can photoshop that out right?" to which I reply "Sure, I charge $100 an hour extra for photoshop manipulation" then they storm away angry with me.
If somebody approaches me, I will do a wedding, (just because I can make more on a wedding then anything else I do) but I don't advertise I do them, just word of mouth.
How do I spot meter? I'm a bit confused on that issue.
-Penguin
EDIT: Dave beat me to this explanation and his pictures make more sense them my words, only thing to add is that there should be a button somewhere to let you spot meter a subject, then hold down or push this button and it holds that metered exposure setting while you recompose and release the shutter. Of course the other option is to just set it manually.
Penguin-
If you are really interested in learning photography I highly recommend reading some of the articles and tutorials on this site:
http://www.cambridgeincolour.com Start with the articles listed under "Photo Essentials." I have no affiliation with them, don't know anything about them, I just stumbled on it a few years ago from another photography forum, and it is by far the best photography learning website I've found.