Suggestions for Nikon D60 & SB-800 / first wedding

This is a casual wedding, long story... they realized too late they hadn't sent a contract in for the photographer they planned to hire. They were happy my friend recommended me. I have a Nikon D60 and just bought the SB-800 flash. The wedding is at 12:30 on the beach only 12 people attending! Blazing sun!!! THen I return in the evening for sunset photos. the reception is the next day & I plan to take some there also. Because I mainly do portraits - and candid shots I am nervous.... and because this SB-800 is new to me - more nervous.



Any help would be appreciated. Basically I am getting started as is. Years ago I was a freelance portrait photographer - specialized in hand colored black and whites. I am so happy to be digital now, and love photoshop. (constantly learning there)



Thanks in advance for any help!