Was in your boat about ~12.5 years ago. Nothing can be compared to getting a dog out of health tested parents that already do the work you want. Nothing can compare to hunting with a dog that was truly bred for it. Natural talent and intelligence will cover a lot of mistakes you will inevitably make. As for energy levels; different breeders breed for different levels of energy. But if you find a knowledgeable breeder they will be all about making sure you get the correct dog with the correct energy level for you. No breeder wants to have a pup-owner miss-match; and those that might breed for higher energy; are really particular about who they place pups with; they know what they are putting out there and want owners able to handle it. I would say the ultra higher energy level breeding are rather rare. On here there are a lot of people who could point in the direction of a good working Labrador litter; even a good Started dogs which will already have training and be all but ready to hunt. Working Golden litters, are harder to find; and it's very rare to come across a started golden. There are some on here that could help; it's not the majority. You'll need to find someone who knows that breed in and out. The minority breeds seem to have more character-quirks in different lines, and you need someone knowledgeable in the breed to help you navigate that.