okay, thanks for your repsonse! now, I don't have a remote and was
planning on handheld?? Do I really need a tripod even if the kit
lends is IS?? also, what is 'mirror lock'?? what spot metering should
I use?? and AF focus? oh and what Mode? I ususally shoot in 'P' mode.
thanks again!
More experienced/better equipped folks may do this differently. For you in this situation, I'd give this a shot:
Assumption1 : You have decent lighting and are not dealing with a situation in which flash is required and the group is not backlit.
Assumption 2: The group is a "reasonable" distance from you -- not way off on stage and not so close that you can't get them in the picture using the kit lens at 18mm (widest) setting.
1. Use Aperture Priority and set your aperture to f/8
2. You can use the kit lens with IS on and no tripod.
3. Use Evaluative or Partial metering. Do not use Spot or Center Weighted.
4. Leave it on One Shot AF
5. Make sure you focus on a person, not the wall behind the group by accident.
6. Take several shots to be safe, and check them on the LCD ensure there is nothing obviously wrong with them.
7. Don't worry about Mirror Lock.
You can also take this picture in Program mode, though you run the risk of it picking an aperture that does not get everyone from front to back in focus.
If you need flash, you need to ensure that the group is "tight" enough and close enough so that your flash get everyone from front to back and left to right. To deep a group, and the back will not get covered or the people in front will be overlit. Too wide a group, and the people on the edges will not be lit, or the folks in the middle will be overlit. If you have to use flash, it would be best to use an external flash like the 430EX or 580EXII.
As an aside, you asked what "spot metering" to use. Spot metering is one type of metering, so what you really wanted to ask was "what metering mode do I use?"
Hope this helps.
David