Keep them as warm as practicable and confined to one side of the hive - they are unable to adequately warm a whole deep box, in the weather we are having, so comb drawing will be reduced.
If as small as you seem to indicate (give us an idea, size-wise (tennis ball, grapefruit, bigger?). Just give them enough frames to accomodate the bees initially, unless you have any spare drawn comb - in which case enough drawn to accommodate the bees and one or two foundations for them to draw.
As the rest say, a small area of open brood would help them to decide to stay (cast swarms are more likely to abscond, I have found).
Don't need a Q/E above the brood, but only remove when doing other things. The 1:1 will be OK for them from either a rapid or contact feeder, and don't leave any holes open in the crownboard! Filling any void beyond the dummy/divider would help as would some insulation above the crownboard.
Was this swarm from your bees? If so, you may need to take precautionary measures to avoid any further losses.
You might consider giving them a small area of emerging brood to boost their numbers (and then possibly more when those bees have emerged). All depends initially of keeping them - they are more likely to stay if warm and cosy with some open brood initially.
Is the hive on a solid floor? If on an OMF, close it up in this cold weather for a few days - every little helps ( bait hives are more successful in attracting swarms if they are reasonably light-tight (ie solid floors).
Apart from all that, good luck!
RAB
