I would recommend Delmar Smith's/Bill Tarrant book. It's old but still applicable today. Read it first then go back to different sections as you progress with your pup. It will explain about the chain gang/stake out chain, force fetching, etc. terms that people use when training.

Also, english setters are usually quick to test you. But once you let them know you're the alpha, they will submit willingly. Alittle training will go along way. I have a Llewellin setter (basically an english setter) one year old pup as is progressing well with training as she listen well. Stubborn at times but generally listens well.

If the dog came from hunting lines, then pup will most likely have that pointing instinct already (steady to wing). Some will quarter naturally. As to introducing the gun to the dog, that's six or seven months down the road. But you'll want a check cord and a .22 starters pistol. Do NOT light firecrackers near, or take them out to a gun range. Do NOT put the dog in front of a line of hunters if the dog only exposure is to the .22. You will need to gradually introduce gun noises, ideally, .22, .410, 20ga/12ga then multiple guns. You can do banging pans, etc. during feedings but will still need to gradually intro to multiple guns.