If you end up having trouble with leash walking, my trainer recommended the easy walk, which is a type of harness that ties the leash in the front. Honestly I feel like I've discovered the holy grail, it has made a huge difference, and now my puppy is coming along really nicely and walking loosely on the leash at my side, regularly looking up at me, unless she gets distracted, but we are also working on focus so she does look up/come back when I say her name.
As the others said IF you need to introduce a correctional type of collar, it should be when he's much older and has more of a foundation, you do not need to use it on your puppy at all.
Have you read any books about puppy rearing and training? If you need any recommendations I'm sure plenty of people here would be happy to provide you with a reading list
