How can I make it so my puppy doesn't eat my ornaments, presents or the tree ?

well the only sure way is to never leave the puppy unsupervised so it doesn't have the chance to do it. Make sure when you see your puppy do something wrong you correct it instantly, say "no" in a deep voice and give the puppy a firm touch (not a smack), it takes time and patience to train a puppy and its important you correct when he/she is in the act of the wrong doing, this way the puppy understands what it is its doing wrong. When you have to leave puppy on its own contain it in a puppy box of a decent size, get the puppy used to its container so it feels comfortable in there and doesn't think its a punishment, good luck!