What do i need to do now to get these bees off to the best start?
OK, feed for a few days, possibly. Just as long as it takes to find exactly what you have.
If there is a strong flow, there is little point in feeding. You should know that from your other colonies, even now.
In a weeks time you will know whether it was a prime or a cast. Could make a considerable difference. Either way you might want to consider requeening with a young mated queen. Prime - she has swarmed and may be superceded before the winter, or may be old and fail during the winter; cast - she may not be laying for two or more weeks and you have no idea of her traits (at least the queen from a prime swarm was a satisfacrory queen).
So, not much different than your other colonies - like are you feeding them at this present time?
Some are claiming a super of honey in around a week. With no brood as yet, your bees could easily be filling the brood with stores and young brood by the end of a week, if a strong prime and a good flow! May not as well, so it is down to you in you locale with your bees to assess and then ask questions.
Remember a kilo of wax (little or none to draw in your case, so you might even want to put on a super to get some drawn comb) is equivalent to anywhere between 5 and 15 kilos of honey and that the swarm is made up from all ages, but the very youngest, of flying bees and not all will be foragers just yet.
RAB
but as a footnote, mine have just started throwing up QC's like there's no tomorrow.
