Well I'm here to tell you there is more then one way to skin a cat. Not that I would skin one because I like cats.Well that's just gross anyway, so on with the information at hand.
There is always a question on what to do with your wine once it is racked into the carboy the first time. At that stage it is not finished fermenting and still has a little way to go for the yeast to eat the rest of the sugar. This is where you get your potential alcohol. Some people expect the airlock to bubble alot more, but it may only bubble occasionally. It will work in it's own time, so be patient. Every wine is different and every yeast will work differently.
The first rack you don't need to add anything although some people add 1/2 teaspoon of sulfites per 5 gallons. There are several options of sulfites. Campdon tablets contain sulfites, but are designed to accomodate 1 pill per gallon. So you would want to add enough to what you are racking. There is also Sodium Metabisulfites and Potassium Metabisulfites. Yes these also double as a cleaner in stronger concentrations.
I think this is what causes confusion. To me as well.These Sulfites are used to eliminate wild yeast and bacteria in the first stages of fermentation. They are use again upon 2nd rackings in small doses as mentioned above, but only after fermentation is done. At that stage you are aging and cleaning your wine by racking it.
Potasium Metabisulfites are prefered over Sodium because it seems to taste better.This is added upon rackings to help clear the wine and stablize it.Myself, I have never added sulfites between rackings, but I also rack more then most people to clear up my wines. Some people are sensitive to sulfites and get migraines from consumption of wine. All commercial wines have sulfites and clarifyers added to them.