I have no idea why a beginner would want to start with WC animals, especially in darts. I have spoken with several people that have had losses of up to 50% in recent importations, and that includes some of the most respected large scale breeders. And when you consider that these people start out with 50-100 frogs...ouch. I would say that quarantine is a definite must with any frog. Unless the breeder has personally treated the animals, I quarantine for a month at least, and even if they have, I still closely monitor them for 1-2 weeks and get fecals done before introducing them to a permanent tank. Also feed/water quarantined frogs after everything else, and use a different dusting cup/spray bottle if possible. Thomas Villegas has some good tips on this issue on his website http://www.pumilo.com. Did you have any particular species in mind?