Proper socialisation is the most important thing you can do with your puppy until he is 16 weeks old. Inadequate or poor socialisation is something your dog may never recover from. Here are a couple of videos discussion what to do and what not to do.
Some video footage of Crystal, the Central Asian Ovcharka. Crystal is reactive to people in the street, at varying distances. She will bark and very often lunge at pedestrians, joggers, cyclists, motor bikes and scooters, bin men and a host of other stimuli. She will rarely, if ever, take food when outside. Her normal tail carriage is high and arched due to her breeding (this is our baseline). As explained in the video, Lynn lives in the city centre and has no option other than having to take Crystal into this environment at least some of the time for walks. We are doing work also in a less stressful environment (local park with plenty space), but is it is essential for us to be able to do some work in the urban area as this is where Lynn lives. We just need to do everything we can to minimse problems and are making excellent progress with her. All the stimuli you see in the video, would previously caused her to lunge at these distances before we started working
If you are having difficulty with your dog not being interested in food during training, here is a step by step guide on how to rectify the problem.
Glasgow Dog Training By Dog Behaviourist John McGuigan 