IMO, the Brittany is a good choice, I had Brittany’s for the better part of my life. They are great family members and hard working, efficient hunters. With luck, I’ll be getting my 6th Brittany hunting partner within the next 6 months or so.
I used Richard Wolters “Gun Dog” as a baseline for training. Very easy book to use..... and it works! I tried cap guns with moderate success, but had my best luck with slapping two small boards together when the pup never expected it. Mostly when eating or playing. Never had a gun shy dog, but did have one that went absolutely bonkers during 4th of July fireworks.
Best advice I can give you regarding training is......... practice, Practice, PRACTICE!!! Repetition will produce a good dog. Train at the speed your dog wants to learn, not at the speed you want him/her to learn. A professional knows how to force train a dog, an amateur doesn’t. Patience is the best tool in your toolbox. When the pup looses interest, stop and pick it up again later. These tips carried me thru 5 dogs. Each successive pup was better than the last, as I learned “how to” from the mistakes I made while training the previous dog(s).
Good luck OP, enjoy the journey