Two schools here, which is good. To me it is essential that dog(s) follow me unleashed as there so many other things or matters to have control over when stalking, especially in full darkness. Next essential would be to trust the dog(s) understanding of command 'sit' and command 'search'. Obviously a young dog has no understanding of those commands and has to be learned. Dogs are bascially domesticated wolfs and with same behaviour i.e. there has to be a leader or alpha. A young dog learns quickly via older dogs.
Anyway, to learn a young dog what stalking is about it really may help to bring an expericenced dog as a company. When I say 'sit' the older dog sits down as he knows the command. The younger dog now imitates the older one and sits down (whith a little help at first ...). So a shot is taken and command 'search' is given. The older dog now runs out and the younger follows. Deer/boar is found and young dog now knows meaning of the command 'search'.
Next time you go out with only the young dog. He follows you unleashed as he is learned to do and sits on command 'sit'. Shot is taken and command 'search' is given and the young one runs out and start searching.
The other school is based on learning a single young dog the meanings of various commands. The dog has no memory or understanding of the meanings of various commands and it takes a (very) long time before entering acceptable behaviour. Risk is that handler becomes restless and raises his voice and the young dog become nervous and of no use. See it all the times, handler shounting commands to dog who don't understand.