NEED help with flash specs on Wedding in two days

[natatbeach]

O.k. so I'm freaking out and I'm not sure why I like or even want to do weddings...but anyway.. here's the deal:

I am using the D70 and an my new SB800 ---I don't know what I'm doing still and trying to figure this out. so I figured instead of looking stupid because the wedding pictures turn out like crap ...I would suck it up and look stupid here asking these questions.
All the info on the flash is still relatively bizarro to me (never worked with a flash this capable before) So my question is in a situation like the one here (see pictures below) what setting should I have my camera set at? and the flash?

I had the camera set at ISO 1000 , 1/60, f/5 , 35mm

I had the flash set at TTL , +1/3 EV, the middle numbers read 3.1- 35ft..and it was angled at a 45 degree angle with the diffuser on..

The place has about 7.5 foot ceilngs(tan drop ceilings) with about a million directional lights going every which way and wall mirrors EVERYWHERE (so trying to find a vantage point where there isn't a giant flaash in the background is really "special"

so what should my settings be? in order to insure a consistent lighting situation without it coming out too dark and without getting harsh crazy shadows...trying to read the manual but not yielding any results Thaks for ANY help.