I need help with digital camera settings! ASAP!?

Hi,
I am going to a wedding rehearsal tonight and want to help out with taking photos. I got a Panasonic DMC-FZ7 Lumix 12x optical zoom camera.

The rehearsal is going to be outside in good California weather at 7pm. It is usually light outside still, but the sun will be going down.

I don't know what ISO to use to get the best pictures in this lighting. My camera has Auto, 80, 100, 200, 400, 800, 1600.

I also dont know what this means:
Aspect ratio: 4:3, 3:2, 16:9

And what do these mean for picture size? 6M, 4MEZ, 3MEZ, 2MEZ, 1MEZ, 0.3MEZ

The biggest they would need to print is 8x10 so what are the best settings for me to take these photos?

What should I start with when it is still light, and then what should I change it to when the sun starts going down/is completely down? This is for my cousin so I want them to turn out the best. They only hired a photographer for the actual wedding.

Any answers are appreciated! The rehearsal is in 5 hours so I need help ASAP :) Thanks.

So do I need to use the flash?
and there is no option for f8?

The previous responders f8 setting suggestion is when you set the camera in aperture priority mode. If you don't understand all this, then use the auto setting on your camera. Putting your camera in a semi-manual mode, like aperture priority, will only get you in trouble if you don't understand what the various settings do.

Please feel free to use your flash. This is the single most important thing you can use to make your pictures nice, especially during daylight hours. Forcing the flash during daylight will help soften the shadows in faces caused by the harsh daytime lighting. You'll notice professional wedding photographers using a flash outdoors during the day light hours for this reason. With your camera, the flash will help out to 6 to 10 feet in daylight. Do a couple experiments ahead of time to figure out how to enable the flash during a daytime shot.

You want to use the lowest ISO setting, e.g. 100. However, as it gets darker, you need to increase the sensitivity of the camera and use a higher ISO setting. You probably don't want to use anything over 400 for decent quality images. 800 is tops for your camera and 1600 will look like crap. Again, if this is too complicated, use Auto.

Bring your camera manual along.

Use 4:3 (aspect ratio). That will use the largest area on your sensor. The other settings are crops (only use a portion of your sensor).

Use the highest resolution (6M).

Bring extra battery, if you have one, and be sure to bring the battery charger. During down times, when people are stuffing their faces, recharge the battery so you won't run out of juice during the important parts.

Use a flash unit. Bring spare batteries and memory cards. Shoot at 100 outdoors, and maximum 400 indoors. Anything beyond 400 is noisy.

Just set picture size to 6M. This means 6 megapixels, the highest resolution on your camera. Use the 4:3 aspect ratio as it is the most common.

Practice and take lots of pictures. Don't be afraid to experiment. Also don't zoom too much. If you need a closeup, move in closer to the subject.

Set the ISO to 400, set the aspect ratio to 3.2, set picture size to 6m. No need to go into details. if the light get really dim, set the ISO to 800 but no higher because the pictures will be noisy. Hold the camera steady and don't get too close.

Put your camera into aperture priority and set the aperture for f8. As it gets darker your shutter times will get longer.

Try using the pop up flash as a fill in if the sky is bright and the couple are in shadow.

Set the ISO to 80 or100, your after best quality here and don't want noise.

Aspect ratio is width vs height 3:2 is the closest to your 10" X 8" aspect ratio so use that.

Always use the highest resolution you can which is 6Mp for your camera, you can always make them smaller you can't make them bigger without a hit on quality. You only get one chance at this.

!!!!!! Practice before the wedding to get it right !!!!!!

Chris