Our puppy bites and is difficult to potty train?

We got a new puppy she is 4 months and we have had her for two weeks. We got her from a petshop and ever since we got her she bites alot and hard and she is difficult to potty train..she won't go to the bathroom outside she rarley does most of the time it is in the house or her crate where she goes any tips??... show more We got a new puppy she is 4 months and we have had her for two weeks. We got her from a petshop and ever since we got her she bites alot and hard and she is difficult to potty train..she won't go to the bathroom outside she rarley does most of the time it is in the house or her crate where she goes any tips?? She is a beagle and boston terrier...Thank you
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