Very carefully and very patiently! There are so many areas to train them in it is amazing. Usually the most important for pet owners is the potty training and that just takes dedication and time. When you observe the dog beginning to potty in a place where you do not want them to, it is important to quickly react, give a firm but not hysterical "NO" and then deposit the dog (even in mid potty) to the place where he/she is supposed to do it. The theory of rubbing their nose in it after the fact is bogus. Nothing ever comes of that in my humble opinion. The potty training stage just is one that all puppy owners must wade through but if you take the time to do it and do it consistently and OFTEN, you can have a very well trained puppy before you know it.
Training a puppy to not chew would be another aspect that comes readily to mind at the forefront. Having many chew toys that are safe and accessible to your puppy will save you many headaches (and many objects that can be damaged in seconds by a puppy chewing). Again, the key is spending time and effort and making sure you know what the puppy is doing. If you cannot watch him/her closely, best to keep them crated while you are busy because their natural instinct is to chew (teething). Biting on people is also a way to massage their gums and giving them a firm "no" while encouraging them for instance with another word "kisses" (what I use) and then further praising them for actually licking or just stopping the biting is a great way to train them to cease and desist on your hands. Any part of a puppy training program though is just all about the patience and the continuing education if you will! They are not puppies forever but it takes time to train them the "right way".