Some videos that I like and feel will help you in training your puppy

Barking/Reacting Help:

Teaching your pup to learn to like to be alone, in an exercise pen
(same ideas can be applied to crate or an enclosed/baby-gated room, etc)
 

Getting a dog/pup used to having their nails clipped
 

Teaching your dog not to pull on leash:
 

Understanding some dog communication in their language to help anxiety and to understand
how to recognize when they are giving these signals