There are two components to this.
1) You missed the time to condition your dog to noises. However this can be remedied.
2) put away the .22's, blanks, what have you. Start with yard work involving live birds and dog on check cord. From there take it to the field. As Mikieb said get the dog out on live birds, I personally would be shooting the birds and letting the dog either retrieve if it does, or show the dog the birds in its face. I would keep the dog on a check cord the whole time. When the dog is on point step on the cord, shoot bird. Praise dog every time.
