The inappropriate mouthing slowed for each of my puppies once they were done teething. Doubling their weight at 4 months of age usually gives you a good idea of their approximate adult weight. Most are potty trained by 4 months but accidents can happen! Expect some issues when they hit 6-9 months, the "teenage" phase can be a challenge. Mine have always slept through the night by 3 months. Those are the few I can think of off the top of my head and of course my own experiences.
Training will be up to YOU! You will get back what you put in. Multiple short sessions that increase in time as the puppy grows and getting in to group classes have been the best things I have ever done.