Have you decided if you are going to train them as flushers or pointers yet? This will determine what range you want them to hunt. Most dogs have that small flash point youre seeing before they pounce in. That does not always mean you will have a pointer. It took a lot of talented people a lot of time to line breed the prolonged pointing instinct into dogs. You have recieved a lot of good info. here. It sounds like they have plenty of prey drive and desire. That is a good time to start your backyard obedience commands. Dont be too harsh. Dont yell. Be consistent doing and requesting everything the same every time so your pups understand what you want from them. If you lose your temper, put pup up and start freshly with the other dog. Before putting a dog up end your session with something he knows how to do and can accomplish. Then praise him with love. If he messes up on a session, do something he can do before putting him up. Keep lessons short (20-30 mins) at least once a day, and always fun and youll have dogs that are eager to get out and learn. I.M.O. choke collars should be outlawed! Ive seen a lot of nasty damage done by them. Try to avoid. If needed use a pinch collar for yard training on heel,sit,& down.
If you are going to have flushers, Start you search pattern training with them using the checkcord to enforce the qaurtering pattern. ONLY RUN 1 Dog at a time or youll waste a lot of time and patience. When they can finally run this search pattern in front of you on thier own, Find a supply of training quil or homing pgeons. Carry a bird bag with you and if pup gets too far out, get his attention as you throw a bird out of the bag (imitate a wild flush). This will start making pup think birds are close to you. Remember, yard work should be done already so that when he wants to chase, youve inforced the COME command. Dont jump back to birds untill you are having consistent results with commands. If you are going to try to inforce the pointing instinct, thats a whole different style of training.
Remember that both the Lab and Vizsla love water! Find a nearby pond or lake and try some water retrieves. It is excellent exercize. Also try to harness your dogs and road them some. Between the water work and the roading you may see thier digging decline. (not always, some dig just to dig). Most of all, WELCOME to the fun world of dog training.Good luck!