Hi mummy2millie
Mostly all commercial made treats have no goodness, are full of artificial colours and all animal bits and pieces (rubbish) go into making them ... ugh! they can aslo upset tiny tums. If you have to use them, only give a few at a time, and make it very small pieces.
Try soft and moist chopped up tiny pieces of lean breast chicken, low fat cheese, low fat and low salt sausage etc for treats, but remember what ever you give as treats it is part of their daily food allowance...slightly reduce main meals to make the difference as we don't want fat over fed pups, which can lead to fat and overweight adults...not good!
Start traing from day 1, find a nice training class in the area if this is your first dog, you will meet lots of other owners, you will socialise puppy nicely and be able to pick up lots of interesting advice on owning and training a dog.
If you don't want your dog upstairs then don't encourage it from the start, stairs will be out of bounds for a while as pups are small, a fall will be dangerous. You can crate train if you want, this can be good especially if you visit others and take your dog with you.
Praise and encouragement will bring rewards, have lots of patience and love to give and you will be fine, ENJOY!
Alison.