Red how old should they be?
For training you can start now. Try and find yourself a mentor. Someone who knows Vizslas or GSP or other pointers. Sounds like your pup has natural abilities. It is your job NOT TO SCREW THOSE NATURAL ABILITIES UP!
I hunted with Bailey at two years old but it would have been best to have waited until he was past "green broke." You don't want a pointing breed to chase birds or move off point when you two are really hunting. Don't hunt with labs or other retrievers or flushing dogs. It will screw up your young pointing dog.
There are many ways to hunt. In "Merle's Door", a great book about a dog and owner in Wyoming, Merle loved to hunt Elk but hated bird work.
Bailey loves birds. In the field he will refuse to eat and only drink when he has to,otherwise, he is driving hard through cover wanting to find that bird, point, let me shoot it and then retrieve it back to me. It is all coming together but has taken many hours, miles of walking and driving and money. Bailey is now just over 3.
If you want to hunt your Vizsla, like a Vizsla was intended to hunt,
as a pointer, you will have to take your time and do lots of training. Mine is now just ready this season to really hunt with me correctly.
Stay away from shotguns until you are SURE he/she is ready for it.
Good luck. There are not enough Vizsla owners, in my opinion, that hunt. It isn't about shooting the bird; it is about bonding with your dog and becoming a team while doing something that man had dog have done for tens of thousands of years.
Good luck and happy hunting (just not yet with the pup)
Rod a.k.a. redbirddog