What setting for my canon 20d at a wedding?

[mark35]

what are the best setting to use at a wedding ac etc? and wht is the best lens out of the 3 i hve thanks guys
canon20d
50mm 1.8
70-200f4l
28-300 tamron
Canon Speedlite 580EX

 

[mark35]

jpeg

 

[mark35]

im just helping a mate out and taking the pics for him told him never done it before and he says its better then nothing

only got one 20d
what about useing the 28-300 tamron for the wedding?