Please help

[davet]

Ok, I'm new with cameras, I've been researching the heck out of it, but it's all new to me and I need some help.

We've built a new stunt on our MTB trail, and tomorrow's the christening and I want to take some pictures (I can't ride, I'm injured). I've got an Olympus C-720 Ultra Zoom. The area where I will be taking the shots is deep in the forest, kinda dark, and the bikes will be going quite quick (wall ride).

The camera has a full manual feature, but I just don't know what most of the things do and I'd like to get some decent shots tomorrow if possible. I've used the auto functions in the past and the shots always seem to turn out blurry and dark.

Also, should I be taking my pics in TIFF mode or one of the lower quality modes. I've got a couple of memory cards, so that isn't a factor.

Please help a newbie out.
Thanks,
Dave