Pose for ALL breeds:
Back foot lined up with the hip, front foot lined up with the eyes. =D
Then past there, it depends on the breed. (Dwarfs, "natural" pose. Lionheads, hella high up pose. Himalayan, stretched out.)
I start working with litters really young. 2 weeks I play with them, 3 weeks we do little couple second poses, by week 6 they're expected to pose and hold for at least 10 seconds without too much fight.
Don't be afraid to show them you're boss. a lot of babies want to fight back. Don't be too rough, but don't let them think they can get away with misbehaving. =D