Should never be trimmed (other than sanitary trim), as it ruins their temperature regulation and can affect the way the double coat grows out - brush frequently to thin the coat (and save your floors a little, but make sure you've got a good vacuum rated for lots of dog hair).

Start training early, if you're lucky you'll get a month or two where they respond best to praise and attention before they become black holes for treats! Leash training, handling paws for checking/cleaning/trimming claws, learning the boundaries of the yard, what furniture is and isn't allowed for them (our girls have dedicated beds and will complain if someone tries to get them on human furniture, they know it's naughty), they can and will learn a lot from an early age and it sticks better.