Photographing an outdoor wedding?

I will be shooting an outdoor wedding. I have a Nikon D3000.It will be my first wedding. It is a small wedding for a friend. I understand it's not the ideal camera for a wedding, but hey its what i have…

I will need to invest in a flash… Not sure what to get.

I also currently have 3 lenses 55-200, 18-55 and 50mm fixed lens.

Any advice would be awesome!

Well Make sure test out your camera first