Depends on how dark it is. If there is enough light that the D700 can accurately auto-focus without using the AF-assist light of the SB-700, then maybe Continuous-servo would work for you.
However, the AF-assist light of the Nikon speedlights will only work when using Single-servo, so I almost always use S for flash indoors. When using flash, I try to use an aperture that ensures I'll get good DOF if the AF gets close to a lock. I find that indoors, the AF-assist light of the speedlight aids camera AF accuracy significantly compared to shooting without it.
I set my Single-servo AF menu setting to fire whether it has an AF lock or not, to ensure that it will fire when I want, even if it is having a hard time locking focus. This is important for some occasional "grab shots", I do try to allow the camera time to get an AF lock for as many shots as possible.
I use Manual metering with Auto-ISO enabled. My minimum ISO is 400 and maximum is 6400. I set my shutter to 1/250 to block out the effects of ambient light. I will adjust shutter speed down as needed, to bring in ambient background light depending on the shot and mood I want to convey. Almost always use iTTL-BL and center-weighted metering.
If I'm doing still portraits (family portraits, or shots of the bride/groom getting ready, etc.) I use S focus mode. I want to be able to lock things in and know it'll stay there. Once the ceremony and reception start, it gets flicked to C mode.
As for metering, I spot meter everything. I ONLY use spot metering unless EVERYTHING I'm shooting (subjects, background, foreground, etc.) are ALL in the sun. Otherwise, I spot meter off of faces or clothing. You learn quickly that if you spot meter off of a black jacket, to up the exposure 1/3 or 2/3 stops, and if you focus on a bright white shirt, you can take it down 1/3 of a stop.
I shoot in RAW anyway, so if I blow exposure by 1/3 or 2/3 stops, it's no biggy. It can always be fixed in post.
Spot focus in S mode on the individual's face. That ALWAYS gives me an accurate reading, even if it's a fair skinned European, or a dark-skinned African American.