Wedding Photography

Hi All

I am looking for some advice.

I have been asked to photograph an upcoming wedding later this year, for me photography is just a hobbie and have kindly said yes because it is for family.

What advice/tips or recommendations would anyone have for me?

What kind of external speedlite would you recommend?

I have only ever photographed two other weddings before (I was a guest at both of them and offered to take some snaps).

I appreciate any help.

The equipment that i have is below:


Canon 30D

Canon EF-S 17-85mm f/4-5.6 IS USM
Canon EF 70-200mm f/2.8 L IS USM

Thanks

Matt