Not telling you what to do, but the 1st thing for me would be get the pup on it's own, no other dogs, however well trained they are.
Secondly, wouldn't do retrieve training everyday, two or three retrieves, two or three times a week I find works very well.
Same with all training I do with pups, only a couple of easy fun tasks at a time, overdoing any aspect of it is a quick way to bore your pup and set yourself up for problems.
Just the way I do it, others will do it differently, cracking pup by the way