Welcome, being a newbie is scary, but you've come to the right place for answers, and remember NO QUESTION IS DUMB!!!!
We've all probably thought them ourselves! The number one thing you need is a good vet, if don't have one already, see if you can get recommendations from a friend or better yet from your breeder. And your puppy probably was just stressed out from the grooming it's alot of work becoming beautiful LOL
. And I'm sure he want's to be beautiful for you. Again welcome.