Oh ok, so very short distance move! Then really the main thing you'll want to do is make sure they have no access into the old coop. They'll likely huddle up next to it or as close as possible on the first few nights, but that makes it easier to round them up and put them in the new one.
Alternatively you can lock the entire flock in the new coop (since 10x12 is easily enough space) for a few days to help home them to it. But once they're out in the run you may still get a few confused birds that aren't sure where to go once it gets dark.