There is no set time as to when to start, myself will not expect much at first, exspecially a younger pup. What I do with the new dogs that come here, is to take couple homing pigeons, and keep a hold of wings and body, then kinda get the pup chasing it in btween my legs, making a chase game out of. Then I will drop it and let it fly off, let dog chase it, when it peels off and comes back to me,I will grab nother and redo, usually after about 4 birds, I will take a wild caught pigeon, card board it, and the dogs will usually either root it up and then catch, or they will point shortly, and then root it and catch. Then it all starts coming together after that. Just couple birds everyother day or, even two or three days without be fine. To much to fast, on some dogs, makes it not a game, and they dont seem to enjoy as well, as skipping day or two.
Cya Jonesy