Just Bought A Papillon??!?

So I went to a dog adoption center today looking to buy my new best friend! Right when I walked in I saw THE CUTEST dog ever, a papillion! It was love at first sight. Apparently it was born on the streets, and was found a few days after it was born without a mom or any brothers or sisters. It’s 13 weeks now, and i haven’t detected any problems concerning it’s knees or anything but it has a tendency to knaw/chew/nibble anything in sight! Is this the norm for dogs their age or is it a problem that I’ll need to address in the future? If it is normal how can I stop her from chewing on ME? Also, if you have any pointers for training her it’ll be much apprecieated. Thanks so much. =]