It's normal and even cute when your puppy nibbles and even lunges at your hand. Since your puppy has been exposed to only other puppies in the litter who naturally play with mouthing and biting, it would make perfect sense why he would assume that playing with you wouldn't be different. But as they grow and their bodies become stronger, what was once cute nibbling eventually turns into uncomfortable or even dangerous rough playing bites.
Puppies are capable of learning simple commands from a very young age but don’t try to give your puppy a meaningful training session if he is tired, highly excited or busy exploring. You need his full attention, otherwise you’re wasting your time. You can build up to training sessions in more distracting environments once your puppy is reliably responding to your commands at home. Dog Training
Unless you plan to keep your dog outdoors--and few of us do because it's not recommended--you'll need to teach your dog where to eliminate. Therefore, house training (also called housebreaking or potty training) is one of the first things you need to work on with your dog. Crate training can be a very helpful part of the training process. This includes house training as well as many other areas of training:

If you’re a bit of a control freak and you expect your puppy to have mastered all of your commands in the first couple of weeks, you may be disappointed. Young puppies, in particular, have a lot to take in in the first few weeks as they settle into their new home away from their mom and litter mates. Start off with two or three commands at the most – sit, come and down should take priority – and don’t move on to new commands until such time as your puppy has mastered the basics. How Do You Use A Target Stick Dog Training ?
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