You should start training as soon as you bring you them home
Basic commands like sit, are used all the time. Both of my guys had sit, down, stay (not very solid) and come pretty down pat by the age of three months. Of course with sits and downs I was still luring them with a treat though, and comes were light happy and fun!
They say that intense training shouldn't begin until six months, but basic commands can be worked on from the start. Take it/Leave it, drop it, enough, are things that are detrimental to your LIFE and your puppies.
As for the breed, I don't know Chi's sorry
