Well I'm not puff but, you start with setting up a quarantine tank and running it for a few weeks or month. I would put maybe 1 or 2 pieces of live rock at most and little or no sand. Having 3 sides of the tank painted black or covered with black background is best (it helps the fish stay calm and reduces stress, thus reducing its ability to contract diseases). Salinity should be very low compared to your display (1.015-1.020). My LFS uses 1.015ish. Ich and other parasites can't survive under low salinity and die off pretty rapidly. Furthermore, under low salinity your fish can breath more and won't have to fight for oxygen as much as it will in say 1.026 salinity. Also lighting should be low. You might not even need to add copper if you do all of the above. Some of the harder fish to keep like mandarins cannot even tolerate any amount of copper. However, if you do decide to quarantine a mandarin make sure you have live copepods to feed it.
I don't have a quarantine tank. What I normally do is drip acclimate everything I put into my tank. As long as it is introduced slowly over the period of an hour or two fish almost always successfully adapt without disease. There are some people that just believe in a QT beyond a doubt, and think that everyone should have and use them. I agree it wouldn't be bad having one setup in the case of emergencies, but regular addition of fish at least in my opinion should be introduced into your tank after drip acclimating.
My theory on ich and QT's:
Ich is a parasite that is always there, but most of the time remains hidden. You are trying to prevent outbreaks of it among your fish. So, you buy a fish from your LFS who has just received it from their distributor (meaning the distributor acclimated it, and then it was acclimated again once received at the LFS). You get the fish home and acclimate it to the QT. Leave it for a few days or a week. Then acclimate it to your display tank. The fish is having to adapt to 4 different environments in a relatively short period of time. If anyone has any sense, it seems hard to think that if the fish you just bought has no visual ailments or diseases then why QT it? You are just putting more stress on the fish. Plus even if you quarantine the fish and then get rid of whatever it has, what's to say when you acclimate it to your display it doesn't have an ich breakout again?
My bottom line, know your LFS and how they receive fish and acclimate them. Also how they deal with ich or other parasites in their store tanks. Don't buy any fish with any white spots or blotches.