I got them from a friend of a friend, she works for my roommate's dad.Where did you get them? They really should still be with mom for at least another 3 weeks.
I would not vaccinate until 8 weeks, then again at 12 and 16. They should also go see a vet ASAP to make sure everything is cool.
I put a ticking clock in the laundry room where they sleep to imitate the rhythm of the mom's heartbeat. Didn't have it in their the first night, they started crying several times. Put it in the second night, not a peep out of them.