Instead of the Y you would use on a double sink, use a T on the center one and tie them together that way. That's the only difference, There is no way to tell exactly what you will need for yours since all situations are different.
Same as a double sink BUT with one extra TEE
I-ID-DONTK-KNOWWORK IT OUT
Same as any sink. The vacuum breaker installs in the backwash unit. Just plumb in hot & cold, and plumb out a drain line.
Same as a single but you will need three (3) tees
Tripple science is one
2 Inch double tee in the middle, pick up both other outlets with the tee, plumb to drain. Have a clean out just above the p-trap, for peace of mind.
You need to check with your local and state building codes, but I have done this many times before. Just make sure that it is utalizing a trap. If you go into the other drain below the other trap make sure you plumb in a new trap for the new sink
Look up a "chicago loop" http://en.wikipedia.org/wiki/Chicago_Loop_%28plumbing%29
To get water to it, and to have it drain
You need a tripple beam balance
You need a tripple beam balance
This question depends on a time frame and depends how quickly you need to plumb a house. The minimum amount of people needed to plumb a house is two and the maximum is.... you can never have enough.