Be aware of important things to avoid with your new puppy:  

Avoid putting your puppy on the ground where unknown animals have been until
he's had all his puppy shots. This is how he picks up diseases.

Avoid having your puppy become unnecessarily frightened in his first few
months of life. Introduce loud noises (vacuum cleaners, hair driers, etc.)
carefully and slowly. Lifetime phobias for your puppy are imprinted during
these early months.  

Avoid overtaxing your new puppy. He needs lots of sleep and tires quickly.  
Be aware of signs of hypoglycemia in small puppies.

Avoid having your puppy around dogs you don't know to be safe and friendly or
around rough children. Your puppy is breakable.

Don't ignore your puppy's whining when confined in his crate. Take him out to
potty, even if it hasn't been long since his last visit outside and you suspect
he just wants attention. If he goes to the bathroom, praise him and allow him
to remain out of his crate for a while. If he doesn't, return him to the crate.
 However, don't reward your puppy for whining by taking him out of his crate
just to play or cuddle. Wait until he's quiet--then take him out!   

Don't allow your puppy to expect to always be held or played with.  
Accustom your puppy to quiet times and being alone for short periods of time.
This will prevent separation anxiety later.   

Don't allow your puppy to feel abandoned by leaving him unattended for long
periods of time.  Know that love and attention are just as important as food and
air to an animal who was born to be a companion to his master.   

Don't forget to praise your puppy. Praise is a stronger motivator than harsh
words or discipline for a puppy who lives to please.   

Don't wait to start training and socializing your new puppy. The first few
months are a critical period in his development and you can't get this time
back!