BEst thing to stop puppies from biting is the "tree" method. Basically, if the puppy bites, you stand up, cross your arms and completely ignore the pup... no eyecontact, not talking, no nothing! Stand absolutely still. If the puppy is biting at your ankles and pant legs, just ignore the behaviour. When the pup stops biting, and looks up at you like "What gives?" reward the pup with a favorite chew toy and a game of tug... when the pup bites again, follow prev. instructions.
Any interaction from your part is fun to a pup, even getting yelled at, as it's still interaction, completely ignoring the pup? not fun, at all. If you never deviate, and ALWAYS follow through with the "tree" method, it will not take long at all for the pup to quit biting at people... it's just NOT FUN!!!