I have a 4month old lab and am going through some of the same things/issues you are. She tends to nip the kids when they are playing, she has stopped nipping me because i make it unpleasant when she does. I either grab her muzzle, stomp on the floor our yell and she gets the message. i try and tell the kids that they cant be rewarding her with pleasant attention when she nips, they, if anything need to ignore her. As for the noises my dog is very skiddish, When i walk her and a car starts she gets afraid along with a list of other noises. From what i have read she is very young and as she grows this will pass. It is important not to force her to do things when they are freaking out, just comfort them. My dogs main issue now is jumping on people, she is about 35lbs and will knock a kid down. Good luck training your dog and have fun.